The Trail of Tears killed thousands of Native Americans forced from their homelands

The Indian Removal Act of 1830 forcibly displaced tens of thousands of Native Americans

Signed by President Andrew Jackson, the act authorized the federal government to negotiate treaties relocating Native nations from their Southeastern homelands to lands west of the Mississippi, often by force.

Europeans' arrival to America brought disease to Indigenous populations

Indigenous people lived in the Americas for centuries before the arrival of the first Europeans in the 15th century. Their arrival was disastrous for Native tribes; in addition to being enslaved and losing their land, they had no natural immunity to the diseases brought by colonists. Eventually, up to 95% of the Native American population was killed by illnesses including typhus, chickenpox, and cholera, an event now known as the Great Dying.

The US Army massacred close to 300 Lakota men, women, and children at Wounded Knee in 1890

Fearing the Ghost Dance—a spiritual movement spreading across starving reservations—the Army surrounded a Lakota encampment at Wounded Knee Creek, South Dakota. When a shot was fired during an attempted disarmament, it sparked chaos, and soldiers killed nearly 300 people.

The US government ran boarding schools designed to erase Native American identity

From the late 19th century into the 20th century, the federal government sent Native children to boarding schools under the philosophy of "kill the Indian, save the man." Children were forbidden from speaking their languages or practicing their cultures, and many endured abuse.

The Dawes Act of 1887 broke up communally held tribal lands

Sometimes called the General Allotment Act, the Dawes Act divided reservation land into individual plots assigned to Native Americans, while "surplus" land was sold to white settlers. The policy led to Native tribes losing roughly 90 million acres, about two-thirds of their remaining land.

Native American tribes still are waiting for museums to return the remains of their ancestors

The remains of more than 100,000 Native Americans are held by prestigious US institutions, despite a 1990 law meant to return them to tribal nations. Here’s how their ancestors were stolen—and how tribes are working to get them back.

The creation of the parks often involved displacing Native tribes

Early parks like Yellowstone, Glacier, and Yosemite involved the removal of tribal communities like the Shoshone, Crow, and Nez Percé, undermining the popular narrative that parks preserved an uninhabited wilderness.

William Clark negotiated one-tenth of all ratified treaties between Native Americans and the US

After the expedition, Clark held key territorial and federal roles, overseeing western expansion and Native relations. While he expressed sympathy for displaced natives, he oversaw the transfer of millions of acres from Native nations to US control through various treaties.

A 2020 Supreme Court ruling affirmed that nearly half of Oklahoma remains tribal land

In McGirt v. Oklahoma, the Supreme Court ruled 5-4 that the Muscogee Nation's reservation was never legally dissolved, thereby stripping Oklahoma of authority to prosecute tribal members for crimes committed on that land. Season One of the "This Land" podcast further explores how reservation court systems operate.

The Red Power movement pushed back against poverty and broken treaty rights in the 1960s and 1970s

Inspired by the Civil Rights Movement, Indigenous activists founded the American Indian Movement, a national advocacy organization, to protest excessive police violence and federal violations of treaty rights, drawing national attention to conditions on reservations.

The Corps of Discovery braved wildlife, weather, and near-starvation

Along their 8,000-mile trek through territory populated by tribes suspicious of their intentions, Lewis and Clark’s party faced many dangers—including grizzly bear attacks, freezing winters, treacherous river crossings, and periods of near-starvation. Watch a 30-minute elaboration of their heroic efforts here.

The Pearl Harbor attack led to the mass internment of Japanese Americans

In the months after Pearl Harbor, the US forcibly removed and incarcerated about 120,000 Japanese Americans—two-thirds of them citizens. Driven by fear and racism, the policy is now recognized as a grave violation of civil rights.

US westward expansion—and the status of slavery in the new territories—was a major cause of the American Civil War

The addition of new western lands forced the nation to confront whether slavery would spread beyond the South. Each debate over the admission of a new state sharpened the divide between free and slaveholding regions.

Indigenous women are murdered at 10 times the rate of all other ethnicities in the US

Murder is the third-leading cause of death among Indigenous women, who are also 2.5 times more likely to experience violence than any other group. More than 4 in 5 Indigenous women have experienced violence in their lifetime.

The Stamp Act's real purpose was protecting colonists from Native Americans

The troops the act funded weren't left in America to guard against France, but to manage the aftermath of Pontiac's Rebellion and keep the peace between colonists and Indigenous nations. Some historians argue this means Native American resistance to British expansion indirectly triggered the tax that sparked the Revolution.

The Iroquois Confederacy's political structure may have shaped the US Constitution

Centuries before the US existed, six Indigenous nations—the Mohawk, Oneida, Onondaga, Cayuga, Seneca, and Tuscarora—united under a shared constitution known as the Great Law of Peace. Some historians argue that the framework of federalism and representative councils influenced the American founders.

View the ten deadliest tornadoes in US history.

Irish immigrants deserted the US Army to fight for Mexico

During the Mexican-American War, hundreds of Irish Catholic immigrants—facing discrimination in the US Army—defected to Mexico and formed the Saint Patrick’s Battalion. Though many were captured and executed, they remain honored as heroes in Mexico.

View the ten deadliest tornadoes in US history.

The Appalachian Mountains blocked east–west boat travel until the Erie Canal

The Appalachian Mountains, spanning from Alabama to Canada, long hindered inland commerce. The Erie Canal created the first reliable water route through the range by leveraging the natural valley of the Mohawk River, revolutionizing trade and migration.

Interactive human migration map

Using archeological, genetic, and climate data, scientists have pieced together an outline of the human odyssey—the journey that took our species from Africa to all corners of the globe. Experience this 200,000-year migration using an interactive human migration map.

'Black Wall Street': the affluent neighborhood of Greenwood in Tulsa, Oklahoma, where Black-owned businesses once thrived

A white mob destroyed Black Wall Street in 1921. America also had other "Black Wall Street" neighborhoods in places like Richmond, Virginia.

What happened after the Civil War?

After the massive devastation and scorched earth wartime methods of the Civil War, the US entered its Reconstruction era. Listen to this podcast to learn what that entailed and who was affected.

The Bill of Rights toured the United States on the Freedom Train from 1947 to 1949

Alongside the Declaration of Independence and the Constitution, the Bill of Rights traveled the country for 18 months. Nearly 3.5 million people viewed the documents as they traveled to all 48 contiguous states in the US. (Alaska and Hawaii were not yet states.)

Stalin's policies intentionally caused a devastating famine in Ukraine

The Holodomor of 1932-33 was a human-made famine resulting from Stalin's grain requisition policies, killing an estimated 3 million to 4 million Ukrainians—considered by many to be an act of genocide.

Why did the Ottoman Empire violently target Armenians during WWI?

In anticipation of threatened Allied landings at the strategically important Gallipoli peninsula, Ottoman authorities arrested 240 Armenian leaders in Constantinople on April 24, 1915, and deported them east. This roundup is commemorated today by Armenians as the beginning of the genocide, according to this article.

In 2018, 26-year-old missionary John Allen Chau was killed by tribesmen after attempting to reach and evangelize on India's isolated North Sentinel Island

'Grand Canyon of the Yellowstone,' a work by American painter Thomas Moran, inspired Congress to establish Yellowstone National Park.

Explore an interactive map of battles from the American Revolution, along with detailed summaries of each engagement

Before writing 'Walden,' transcendentalist Henry David Thoreau nearly burned down his hometown with a campfire that grew out of control.

The Russia-Ukraine conflict is the largest ground war in Europe since World War II in terms of casualties, forces mobilized, and displacement of civilians.

Abraham Lincoln was almost assassinated weeks before his inauguration as he traveled from Illinois to DC through Baltimore in 1861; it took two independent claims for Lincoln to be convinced the threat was real

See a 3D reconstruction of Tenochtitlan, the Aztec capital that was home to an estimated population of 200,000 to 400,000.

Gerrymandering works through two techniques: cracking opposing voters across districts to dilute their power, and packing them into a few to waste their votes in lopsided majorities.

Experimental hantavirus vaccines and therapies, still under development, have long been funded by the US military.

The US Constitution is widely regarded as the longest-standing written national constitution still in force—see how it has influenced rights worldwide.

The story of Dollree Mapp, whose legal challenge over her 1957 conviction for possessing "obscene material" led to a major strengthening of the Fourth Amendment

Take a 3D tour of the Hajj, Islam's annual pilgrimage to Mecca, undertaken by over 1.5 million Muslims.

The American cockroach is actually from Africa, an apparent hitchhiker aboard ships carrying enslaved people, with evidence suggesting the bug may have arrived in the New World as early as the 1600s.

Ebola infects and disables immune cells, triggering a cascade of events that leads to small blood clots throughout the body, weakening blood vessels and interrupting blood flow to key organs.

The first line of 'immortal' human cells, which can divide indefinitely and are used in scientific research, was nonconsensually taken from a Black woman.

Poison ivy's rash-causing compound is found in the plant's roots, stem, and leaves—so coming into contact with any part of the plant can lead to rashes for the 85% of people who are allergic to it.

A 2019 Facebook event called on attendees to "Storm Area 51, They Can't Stop All of Us," resulting in countless memes, the creation of a music festival, and eventually the arrests of those who did try to approach the area.

Watch contemporary footage covering the US-backed Shah of Iran fleeing the country in the face of the 1979 Iranian Revolution

In 1984, Operation Smash Hit intentionally crashed a 239-ton train into a nuclear waste canister at 100 miles per hour to prove the canister's safety, which remained completely intact and lost just 0.29 of its 100 pounds of pressure.

The boiling temperature of water decreases with increasing elevation because the molecules need less energy to overcome the lower atmospheric pressure associated with thinner air.

About 2,000 US babies are born annually without some portion of their limbs, potentially leading to a lifetime of pricey prosthetics.

In 1939, baseball star Lou Gehrig delivered his inspirational 'Luckiest Man' speech after retiring due to the health condition that now bears his name.

Track the location of the Voyager probes, currently between 13 and 15 billion miles away from Earth.

After the Boston Tea Party, colonists switched to coffee, which became the main morning drink for revolutionaries.