Some of these made the textbooks. The worst parts didn’t.
American history classes spend a lot of time on a relatively short list of events, like the Revolution, the Civil War, the World Wars, and a few civil rights milestones. What gets cut, glossed over, or quietly skipped is often where the real story is, from the massacres and experiments to the broken promises and policies that shaped entire communities — and were then left out of the textbooks. So, here are 13 dark facts about American history that most of us were never taught in school:
1. On October 24, 1871, a mob killed at least 17 Chinese men and boys in Los Angeles in roughly two hours — more than 10% of the city’s Chinese population — in what is still considered one of the largest mass lynchings in American history. Eight men were convicted. Every conviction was overturned on a technicality.
In 1871, Los Angeles was a frontier town where Chinese immigrants were vital to the labor force but were denied the right to vote or testify in court against white people. After a shootout between rival Chinese mutual benefit associations left a white rancher named Robert Thompson dead, a mob of roughly 500 white and Latino Angelenos — about 10% of the city’s population — descended on the Chinese quarter along Calle de los Negros.
Within about two hours, at least 17 Chinese men and boys were shot, hanged, and mutilated. Most had nothing to do with the original conflict. Fifteen were lynched from a wooden awning at John Goller’s wagon shop and from Tomlinson’s corral. One of the victims was Dr. Chee Long “Gene” Tong, a respected herbalist who reportedly begged for his life and offered his diamond ring. A rioter cut off his finger to take it. The dead represented more than 10% of LA’s Chinese population of 172.
A grand jury issued 25 indictments. Only 10 men stood trial, and 8 were convicted of manslaughter. In 1873, the California Supreme Court overturned every conviction because the indictment had failed to explicitly state that Dr. Tong had been “murdered.” Because the law at the time barred Chinese people from testifying against white defendants, the victims’ community had no legal voice in the proceedings. District Attorney Cameron Thom declined to retry the case. No one served meaningful time.
2. On September 2, 1885, a mob of 150 white miners in Rock Springs, Wyoming, killed at least 28 Chinese coal workers, burned all 79 homes in the town’s Chinatown, and threw wounded survivors into the flames. The Chinese miners had been paid less than white workers for the same work, and the company that created those conditions faced no consequences. Neither did anyone else.
At the Union Pacific coal mines in Rock Springs, Wyoming Territory, the company paid Chinese miners less than white miners and used them to undercut strikes organized by white workers through the Knights of Labor. On September 2, 1885, a dispute over who had the right to work a rich coal seam in Pit No. 6 turned violent. That afternoon, an armed mob of about 150 white miners surrounded Rock Springs’ Chinatown and gave residents one hour to leave, then attacked before the hour was up.
By nightfall, at least 28 Chinese miners were dead, 15 were wounded, and all 79 homes in Chinatown had been looted and burned, with some wounded victims thrown back into the flames. Several hundred Chinese fled into the surrounding hills. Property damage totaled roughly $150,000 (about $4.8 million today).
Sixteen men were arrested. A Sweetwater County grand jury declined to indict, declaring it could find “no one … able to testify to a single criminal act committed by any known white person that day.” When the men were released, they were greeted with what the New York Times called “a regular ovation.” Union Pacific fired 45 of the white miners but rehired most of the Chinese survivors at federal-troop bayonet point a week later, ordering them back to work or be blacklisted across the entire UP system. The government sent troops not to arrest the killers but to get the railroad’s labor force back. No one was ever prosecuted.
Sources: WyoHistory, Library of Congress, History
3. Between the early 1900s and the 1930s, tens of thousands of young Filipino men were recruited to work American farms as US colonial subjects — then trapped by laws that barred them from marrying, owning land, or becoming citizens. An entire generation grew old alone. And the man who started the Delano Grape Strike before Cesar Chavez joined wasn’t added to California’s school curriculum until 2015.
After the 1898 Spanish-American War, the United States took control of the Philippines. Because it was a US territory, Filipinos were classified as “US nationals.” They carried US passports and could travel freely to fill the labor demand on California farms, Washington fields, and Alaska salmon canneries. They became known as the manong generation — “manong” meaning “older brother” in Ilocano.
But when the Great Depression hit in the 1930s, white workers saw them as competition. The US solved this with the 1934 Tydings-McDuffie Act, which promised the Philippines independence, but its practical effect was to reclassify Filipinos as “aliens” and cap their immigration at just 50 people per year. The men already in the US were stuck. Anti-miscegenation laws in California and other Western states classified Filipinos as “Mongolians” and later “Malays,” barring them from marrying white women. With almost no Filipina immigrants in the country and no path to citizenship until 1946, an entire generation of men grew old as forced bachelors in single-room-occupancy hotels in Stockton’s Little Manila, Seattle, and the Central Valley.
One of them was Larry Itliong, a labor organizer known as “Seven Fingers” because he had lost three fingers in an Alaskan cannery. On September 7, 1965, Itliong led about 1,500 Filipino grape workers off the farms around Delano, California. A week later, he persuaded Cesar Chavez and Mexican American farmworkers to join. Their unions merged in 1966 as the United Farm Workers, with Chavez as director and Itliong as assistant director. Itliong eventually resigned in 1971 and died of ALS in 1977. One of his final projects was Agbayani Village, a retirement home in Delano for aging manongs who had no families to care for them. The last resident, Fred Abad, died in 1997. California did not add Itliong to its recommended K–12 curriculum until 2015–2016.
Sources: National Park Service, Smithsonian Magazine, US Department of Labor
4. Beginning in 1917, the US Radium Corporation hired young women to paint watch dials with radioactive paint and told them to shape the brush with their lips. The company’s own chemists used lead screens and tongs. When the women’s jaws began disintegrating and they tried to sue, the company hired investigators to discredit them — and tried to blame their illness on syphilis.
The US Radium Corporation’s plant in Orange, New Jersey, hired about 70 women — many of them teenagers — to paint glow-in-the-dark dials on watches, instruments, and military equipment using “Undark,” a paint containing radium-226. Workers were trained to “lip, dip, paint,” meaning shape the brush tip between their lips, dip it into the paint, then paint the dial. They earned about 1.5 cents per dial. Some painted their nails, teeth, and faces with the glowing paint for fun because they had been told it was harmless.
The company’s chemists, including the paint’s inventor, Dr. Sabin von Sochocky, used lead screens, tongs, and lab coats. The women were given nothing.
By 1924, at least 50 of the workers had reported severe illness, and 12 had died. Their teeth fell out. Their jaws deteriorated and crumbled, a condition that became known as “radium jaw.” Their bones weakened and broke.
When the women tried to hold the company accountable, US Radium ran a coordinated campaign to discredit them. They hired a Columbia University “specialist” named Frederick Flynn to falsely declare Grace Fryer healthy. In some cases, the company attributed the women’s symptoms to syphilis, a sexually transmitted disease that in the 1920s was not just a medical diagnosis but a social death sentence for a young woman.
Fryer spent two years trying to find a lawyer willing to take the case. In 1927, attorney Raymond Berry filed suit on behalf of Fryer, Edna Hussman, Katherine Schaub, and sisters Quinta McDonald and Albina Larice. The press called it “The Case of the Five Women Doomed to Die.” By the time the case moved forward, the women were so sick they could barely raise their arms in court.
US Radium settled in 1928. Each woman received $10,000, a $600 annual annuity, and lifetime medical costs. All five were dead within a decade. Their case helped establish the legal right for workers to sue employers for occupational disease and shaped what eventually became OSHA.
Sources: Environmental History, The Archive, Britannica
5. For 40 years, the US Public Health Service told 399 Black men in Alabama they were being treated for “bad blood” while deliberately withholding the cure for syphilis — even though treatment had been available for decades, and white patients were receiving it. At least 28 men died directly. No one was ever prosecuted.
Syphilis was not an untreatable mystery in the 1930s. Since 1910, doctors had been using Salvarsan, an arsenic-based drug that was the most widely prescribed medication in the world and was effective against early-stage syphilis. By the time the Tuskegee study began in 1932, treatment with arsenic compounds was standard medical practice for syphilis patients — including white patients — across the United States. The treatment was expensive and involved repeated injections over more than a year, but it existed, and it worked.
Starting in 1932, the US Public Health Service recruited 399 Black men with latent syphilis and 201 uninfected controls in and around Tuskegee, Alabama, telling them they were being treated for “bad blood.” In reality, the government wanted to study what happened when syphilis went completely untreated in the human body. They offered the men free medical exams, meals, and burial insurance. They never gave them actual treatment.
The Public Health Service didn’t withhold treatment because there was none. They withheld it because the study required observing what happened when the disease ran its full course — something they could only do by making sure the men never got better. Then, in the mid-1940s, penicillin emerged as a faster, cheaper, and more effective cure and became the standard of care for syphilis nationwide. White patients received it. The men in Tuskegee did not. Researchers actively tracked the men to make sure they didn’t receive treatment from other doctors or clinics. One local physician was reprimanded for “ruining one of our volunteers.”
By the end of the study, at least 28 men had died directly of syphilis, roughly 100 of related complications, 40 wives had been infected, and 19 children had been born with congenital syphilis.
Peter Buxtun, a young PHS venereal-disease investigator in San Francisco, raised internal objections starting in 1966. After a blue-ribbon panel voted in 1969 to continue the study, Buxtun leaked documents to the Associated Press. Reporter Jean Heller published the story on July 25, 1972. The study ended within months.
A 1973 class-action suit resulted in a $10 million settlement and free medical care for survivors and their families. President Bill Clinton issued a formal apology in 1997. No one in the Public Health Service was ever criminally prosecuted. The study is widely cited as a foundational cause of medical mistrust in Black communities, including resistance to organ donation and COVID-19 vaccines.
Sources: NPR, PBS, Government Accountability Project, CDC, Smithsonian Magazine
6. Between 1907 and the 2010s, more than 60,000 Americans were forcibly sterilized under state eugenics laws. California’s program directly inspired Nazi Germany’s sterilization law. Forced sterilizations were still happening in California prisons as recently as 2010. The Supreme Court decision that made it all legal has never been overturned.
In the early 20th century, eugenics — the belief that the government could improve the population by preventing “unfit” people from reproducing — was widely embraced by American scientists, politicians, and philanthropists. “Unfit” was defined broadly and conveniently. It included people with disabilities, people with mental illness, people who were poor, people who were promiscuous, people who were immigrants, and, disproportionately, people who were Black, Latino, or Native American. States passed laws authorizing the forced sterilization of people in state institutions — prisons, asylums, homes for the “feeble-minded” — without their consent and often without their knowledge.
Indiana passed the first compulsory sterilization law in 1907. Eventually, more than 30 states followed. The legal framework was cemented in 1927 when the Supreme Court decided Buck v. Bell. Carrie Buck was a 20-year-old white woman in Virginia who had been committed to the Virginia State Colony for Epileptics and Feebleminded after being raped by a relative of her foster family. The state argued that Buck, her mother, and her infant daughter represented “three generations of imbeciles” and that sterilizing Buck served the public interest. Justice Oliver Wendell Holmes Jr. wrote the 8–1 majority opinion upholding Virginia’s sterilization law, declaring: “Three generations of imbeciles are enough.”
Historian Paul Lombardo later showed that Carrie Buck was not intellectually disabled — she had been institutionalized to hide the rape — and her daughter Vivian made the honor roll before dying young of a childhood illness.
An estimated 60,000 to 70,000 Americans were forcibly sterilized under these laws. California alone sterilized roughly 20,000 people, about one-third of the national total. The influence went global. Nazi Germany modeled its 1933 Law for the Prevention of Hereditarily Diseased Offspring on American eugenics policy, specifically on Harry Laughlin’s “Model Eugenic Sterilization Law.” At the Nuremberg Trials, Nazi defendants cited Buck v. Bell in their defense.
Forced sterilization did not end with the early eugenics movement. North Carolina’s program ran until 1977. A 2013 Center for Investigative Reporting investigation found that at least 148 women, disproportionately Black and Latina, were sterilized in California prisons between 2006 and 2010, often without lawful consent.
California began paying reparations of up to $25,000 per survivor in 2022. The Supreme Court has never explicitly overturned Buck v. Bell.
Sources: NPR, Encyclopedia Virginia, CapRadio
7. More than 260,000 Filipino soldiers fought under the American flag in World War II — including through the Bataan Death March — after being promised full veterans’ benefits. After the war, Congress passed a law retroactively declaring their service didn’t count. Of the 66 Allied nations in WWII, Filipino veterans were the only group singled out.
The Philippines was strategically critical to the United States in the Pacific. After Pearl Harbor, the islands served as a forward base against Japan, and their defense and eventual recapture were central to the Pacific war strategy. General Douglas MacArthur famously declared “I shall return” after being ordered to leave the Philippines in 1942, and the brutal campaign to retake the islands from Japanese occupation cost tens of thousands of American and Filipino lives.
On July 26, 1941, President Franklin D. Roosevelt issued a military order incorporating the Philippine Commonwealth Army into the US Armed Forces of the Far East under MacArthur, promising full US veterans’ benefits — the same GI Bill access, pensions, and healthcare that any American soldier would receive. More than 260,000 Filipino soldiers fought under that promise. They endured the Bataan Death March, Japanese prisoner-of-war camps, and years of guerrilla warfare in the jungle.
Then, on February 18, 1946, President Harry Truman signed the Rescission Act. The law retroactively declared that Filipino service “shall not be deemed to have been active military, naval, or air service” for the purposes of US veterans’ benefits, stripping a promised $3 billion in benefits in exchange for a single $200 million payment to the Philippine government. Of 66 Allied nations in WWII, Filipino veterans were the only group singled out this way.
Truman himself wrote in his signing statement that the Filipino veteran “is entitled to benefits bearing a reasonable relation to those received by the American veteran.” They did not get them.
Veterans spent decades organizing for recognition. Naturalization rights came in 1990. Limited VA health care followed in 2003. The 2009 American Recovery and Reinvestment Act established a compensation fund offering a one-time payment of $15,000 for US citizens or $9,000 for Philippine residents. By the time payments began, many veterans had already died. Many claims were denied because Japanese forces had destroyed wartime records. The legal provision that stripped Filipino veterans’ benefits, 38 U.S.C. § 107, remains part of US law.
Sources: NBC News, Obama White House Archives, GovInfo
8. Between 1946 and 1958, the United States detonated 67 nuclear weapons in the Marshall Islands, the equivalent of more than 7,000 Hiroshima bombs. The atolls were not uninhabited. Residents were told the relocation was temporary and “for the good of mankind.” Then the government turned the exposed islanders into research subjects without their consent.
The United States began testing nuclear weapons in the Pacific in 1946, just a year after Hiroshima and Nagasaki. The Marshall Islands — a chain of 29 coral atolls and 5 islands roughly halfway between Hawaii and Australia — were selected because they were remote, under US control as a United Nations Trust Territory, and, in the military’s calculus, expendable.
The atolls were not uninhabited. Bikini had 167 residents. Enewetak had several hundred more. In February 1946, Navy Commodore Ben H. Wyatt assembled the Bikinians after a Sunday church service and asked them to leave their home “for the good of mankind and to end all world wars.” Their leader, King Juda, answered: “We will go, believing that everything is in the hands of God.” They were told the relocation would be temporary. It was not. The Bikinians were moved to Rongerik Atoll, where they nearly starved by 1948; then to Kwajalein; and finally to Kili Island, where their descendants remain today.
Between 1946 and 1958, the US detonated 67 nuclear weapons across both atolls — 23 at Bikini and 44 at Enewetak — with a combined explosive force equivalent to 108.5 megatons of TNT. The tests included underwater detonations, surface blasts, and atmospheric shots. Some vaporized entire islands. Elugelab Island on Enewetak Atoll was completely obliterated by the first hydrogen bomb test, Ivy Mike, in 1952. It no longer exists.
The most devastating test was Castle Bravo on March 1, 1954. It exploded at 15 megatons — about 1,000 times the Hiroshima bomb and more than double what scientists had predicted — sending radioactive fallout east onto inhabited Rongelap, Ailinginae, and Utirik atolls. Children played in the powdery fallout, mistaking it for snow. Rongelap residents received an estimated 175 rads of exposure before being evacuated roughly 48 hours later.
Then came Project 4.1, a classified study that turned the exposed Marshallese into research subjects without their informed consent. At an Atomic Energy Commission advisory meeting in January 1956, Health and Safety Lab director Merril Eisenbud said of returning Rongelap residents to their contaminated home: “While it is true that these people do not live the way Westerners do, civilized people, it is nevertheless also true that these people are more like us than the mice.”
Bikini Atoll remains unsafe for permanent habitation. A 2019 Columbia University study found cesium-137 in Bikini fruit above international safety standards, and background gamma radiation at nearly double the agreed safe limit. Marshallese people can live and work in the US under the Compact of Free Association, but they spent decades fighting for adequate healthcare, compensation, and recognition for what US nuclear testing did to their islands and bodies.
Sources: Arms Control Association, National Security Archive, PNAS, Medicaid.gov
9. From 1956 to 1971, the FBI ran a covert program called COINTELPRO that targeted civil rights leaders, antiwar groups, and Black activist organizations. The program ran over 2,000 operations, sent Martin Luther King Jr. a letter urging him to kill himself, and set up the raid that killed 21-year-old Fred Hampton in his bed.
From 1956 to 1971, the FBI operated COINTELPRO — the Counter Intelligence Program — a covert domestic surveillance and disruption operation that targeted civil rights organizations, anti-war groups, the American Indian Movement, socialist organizations, and Black nationalist movements. Under FBI Director J. Edgar Hoover, COINTELPRO’s stated mission was to “expose, disrupt, misdirect, discredit, or otherwise neutralize” groups the bureau considered subversive.
The program ran over 2,000 documented operations. Tactics included wiretapping, infiltrating organizations with informants, sending forged letters to provoke infighting, planting false stories in newspapers, and coordinating with local police to harass, arrest, or physically attack targets. In November 1964, the FBI mailed Martin Luther King Jr. an anonymous package containing surveillance recordings and a letter widely interpreted as urging him to complete suicide. The letter was timed to arrive before King traveled to accept the Nobel Peace Prize.
The most notorious COINTELPRO operation targeted Fred Hampton, the 21-year-old deputy chairman of the Illinois Black Panther Party in Chicago. Hampton was building what he called a “Rainbow Coalition,” an alliance between the Black Panthers, the Puerto Rican Young Lords, and the Young Patriots, a group of poor white Appalachian migrants. The coalition organized free breakfast programs, medical clinics, and political education across racial lines. The FBI classified Hampton as a “key militant leader” and assigned an informant, William O’Neal, to infiltrate his inner circle. O’Neal — recruited by Special Agent Roy Martin Mitchell after a car-theft arrest in 1968 — became Hampton’s head of security and provided the FBI with a detailed hand-drawn floor plan of his apartment at 2337 West Monroe Street.
On the night of December 3, 1969, O’Neal slipped the barbiturate secobarbital into Hampton’s drink. At approximately 4:45 a.m. on December 4, fourteen Chicago police officers attached to Cook County State’s Attorney Edward Hanrahan raided the apartment. According to the federal grand jury report, police fired between 90 and 99 shots. The Panthers fired one, a single reflexive discharge from Mark Clark’s shotgun as he was fatally shot. Hampton was unconscious in bed beside his pregnant fiancée, Akua Njeri, when he was shot twice in the head at close range. An officer reportedly said, “He’s good and dead now.” The FBI later approved a $300 bonus for O’Neal’s handler.
In 1982, the federal government and the City of Chicago paid $1.85 million to the victims’ families. No senior FBI official was ever prosecuted. COINTELPRO was only exposed in 1971 after activists broke into an FBI field office in Media, Pennsylvania, and stole internal files.
Sources: History, National Archives, Harvard Political Review
10. After Pearl Harbor, the US Navy seized a sacred Hawaiian island and used it as a bombing range for nearly 50 years. In 1977, a 26-year-old Native Hawaiian activist named George Helm disappeared at sea trying to stop it. His body was never found. When the island was finally returned, a quarter of it was still contaminated with unexploded ordnance.
