The trans-Atlantic slave trade brought over 10 million enslaved people to the Americas

A timelapse mapping more than 30,000 Transatlantic slave ship voyages

Roughly 12 million people from Africa were forcibly moved to North and South America over two centuries. This map meticulously showcases every ship's origin, destination, timeline, and more, revealing the scale of the Transatlantic slave trade.

Slavery in the US: a timeline

In 1619, a ship with 20 captives landed at Point Comfort in Virginia, ushering in the era of American slavery. Scroll through this timeline to learn more about slavery in the US and its long lasting effects.

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 South built its wealth largely from slave labor

Before the Civil War, the Southern economy relied on roughly 4 million enslaved people producing cash crops such as cotton, rice, and sugarcane. Their forced labor generated immense profits—the South produced 75% of the world's cotton by 1860.

What was life like as a slave in the US?

Over 2,500 former slaves were interviewed by writers and journalists in the late 1930s as part of the US Federal Writer's Project. The collection recorded images and firsthand verbal accounts of life as a slave, eight of which are highlighted in this article at the Library of Congress. See the humanity in each of these individuals with their firsthand accounts.

Approximately 180,000 African Americans served in Union forces

About 180,000 Black soldiers—roughly 10% of the Union army—served in the United States Colored Troops after 1863. Despite lower pay and discrimination, they were crucial to the Union victory.

One in five 16th century Spanish ships sank while crossing the Atlantic

Despite the incredibly high rate of catastrophic wrecks, during the Age of Exploration Spanish investors continued to fund voyages. Here, economists break down the incentives that led to increased risk, including short travel seasons and the propensity to overload ships.

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.

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

This podcast delves into the history of Periplaneta americana and explores why the bugs elicit such fear, disgust, and, at times, shame. The bug likely climbed aboard the slave ships because they had both unprotected food sources and places to hide during their journey.

That time British slavers killed enslaved people and filed for insurance reimbursement

In 1781, a British slave ship tossed 132 enslaved Africans overboard, leaving them to drown. This 52-minute podcast explores the context behind the massacre and its implications. The slavers of the ship named Zong sought insurance reimbursement for...

European colonization contributed to coffee's spread

European colonization created channels for large-scale coffee exports with workforces based in Asia, Latin America and the Caribbean. Trade routes throughout the Middle East and the rest of the world carried the drink to new shores and changed the agricultural and economic landscapes of the countries in the Bean Belt.

More than 2,000 Black Americans were victims of racial terror lynchings from 1865 to 1876

The Equal Justice Initiative documented over 2,000 lynchings of Black people during Reconstruction—violence that attempted to restore white supremacy, suppress Black political power, and terrorize communities in the aftermath of emancipation.

The transatlantic cable allowed for communications between North America and Europe

It had significant impacts on just about every industry, including finance. Specifically, the transatlantic cable made it so that real-time financial transactions could take place across the Atlantic, and allowed for much faster sharing of information that increased global market accuracy.

Support for slavery helped drive Texas to revolt against Mexico

Mexico abolished slavery in 1829, but many Anglo-American settlers in Texas brought enslaved people and refused to comply. Their desire to preserve slavery was a major factor in Texas’s 1836 rebellion and independence from Mexico.

The Great Migration helped transform Harlem into the epicenter of Black culture

Starting in 1910, millions of Black Americans moved from the South to escape segregation, violence, and dismal work opportunities. They moved to urban areas in the North, Midwest, and West. Chief among them was Manhattan's Harlem neighborhood, which became an especially desirable location for Black people around 1910.

Since the revolution, approximately 1.4 million Cubans have fled to the US

Although Castro initially enjoyed broad support after toppling Batista in 1959, nearly 2 million Cubans chose exile in the years that followed. Most settled in the US, while others dispersed across Latin America and Europe, shaping migration patterns that persist to this day

250 years of world trade history

Adam Smith’s revolutionary ideas about free trade were often ignored throughout American history to protect domestic industry—until World War II caused a shift in sentiment about global trade.

The British Royal Navy—not the US military—enforced the Monroe Doctrine for most of the 19th century

In the early to mid-1800s, the US lacked the ships and military power to prevent European nations from colonizing the Americas. Britain enforced this to protect its commercial interests by keeping rival European powers out of Latin America.

Spartacus: Enslaved ancient Roman gladiator turned revolt leader

Sold into slavery and forced to be a gladiator, Spartacus ultimately took the fight outside the arena and revolted against the Romans. This article dives into the history of the rebel leader. Spartacus was originally from Thrace, a part of ancient Europe that included parts of modern-day Bulgaria, Turkey, and Greece. Exactly what led to his enslavement is unclear, but it likely involved ancient Rome's attempt to subjugate Thrace.

Nearly all American skilled workers deserted the canal worksite the first year

More than 75,000 workers labored to build the Panama Canal, and up to a third of them, by some estimates, died on the job. This gallery of 16 archival black-and-white photographs from PBS shows what life was like for the workers.

The Louisiana Purchase nearly doubled America’s size in 1803

Acquired from France for $15M, the Louisiana Purchase added 828,000 square miles to the United States—stretching from the Mississippi River to the Rockies. US ambassadors in France signed the papers to buy the tract from the embattled Napoleon Bonaparte for a mere $15M before Jefferson learned the terms, due to the advantageous nature of the deal.

Global xenotransplantation market may already be valued at more than $13B

With more than 100,000 people on the waiting list for organs at any given time in the United States, there's a known demand for organ transplants. Some estimates put the value of the global xenotransplantation market above $13B in recent years—and project the market to continue growing.

One in 10 adults worldwide has diabetes

As of 2021, diabetes claimed at least 6.7 million lives and continues to kill one person every five seconds. Nearly one in two adults with diabetes don't know they have the condition, which is expected to increase in prevalence from 537 million in 2021, to 783 million in 2045.

Niagara Falls was a key Underground Railroad crossing point

In the mid-1800s, the Suspension Bridge near Niagara Falls connected the US to Canada and served as a frequent crossing location for people escaping slavery via the Underground Railroad.

What happened to Americans who were in Japan during Pearl Harbor?

When Japan bombed Pearl Harbor in December 1941, roughly 10,000 American civilians were stranded in Japanese-occupied territory. Tense diplomatic negotiations eventually secured two prisoner exchanges conducted via ship across 20,000 nautical miles to return nearly 3,000 Allied civilians, while Japanese Americans in North and South America were sent in the opposite direction, many to a country they had never called home.

Estimates say 2.5 billion total T. rexes lived on Earth

Roughly 68 million years ago, the Tyrannosaurus rex was king of the North American ecosystem. Researchers used the dinosaur's size, metabolic rate, age of sexual maturity, and other factors to determine 20,000 individuals likely were alive at any given time, more than 120,000 20-year generations. This piece breaks down how they arrived at those numbers.

The United States has had a tumultuous relationship with Cuba since its 1959 revolution, highlighted by a nuclear crisis and a decades-long trade embargo.

Roughly 43 million US borrowers owe roughly $1.7T in student debt, the second-largest source of consumer debt behind mortgages.

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

See how Ebola tore through Guinea, Sierra Leone, and Liberia in 2014-2016.

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

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

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

Volcanic activity may have triggered the Black Death by spewing gases that led to crop failures in Europe, thus forcing the import of grain ships with plague-infested fleas.

Quincy Jones' 'Big Band Bossa Nova' helped introduce bossa nova—a jazz-influenced Brazilian genre—to the US

See how each of the more than two million known species relates to each other—and to common ancestors—in this zoomable tree of life.

While the first exchange-traded fund (a 'basket' of different assets that can be bought and sold on a stock exchange) in the US only launched in 1993, the global ETF market has grown to more than $10T in the short time since.

Before humans, the Soviet Union and the United States sent animals—including apes, dogs, and cats—to space during the Space Race.

The US first hosted the World Cup in 1994, a tournament that lives in soccer infamy for its poor planning and the murder of Colombian player Andres Escobar, who'd accidentally scored on his own net.

Discover the catastrophic consequences of a failure of the US electrical grid—something that is more likely than many Americans think.

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

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

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

Hear about the 250-year history of the United States Postal Service, complete with some of its strangest deliveries, important innovations, and the figures that made it an American institution.

Bone marrow (soft tissue found inside certain bones) generates roughly 500 billion new blood cells each day

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.

Between 10 million and 50 million people in the US develop rashes from poison ivy, poison sumac, and poison oak each year.

The Mona Lisa's celebrity status and repeated restorations have obscured what made the painting so revolutionary for its time

The Nasdaq's 'Magnificent 7' companies are responsible for roughly 40% of the Nasdaq 100 index's gains, while the remaining 93 companies account for the other 60%.

El Niño, Spanish for 'the boy,' was named after Jesus Christ because the phenomenon resembled the weather changes observed around Christmastime.