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In the early 1800s, slavery rapidly expanded across the American South. But each year, thousands of courageous enslaved men, women, and children fled their owners in search of freedom. And in Philadelphia, secret allies came to their aid. Quaker abolitionists collaborated with free Black people to bring the freedom seekers to safety.  It was the start of the Underground Railroad, a clandestine network of activists, safe houses, and escape routes that would help tens of thousands of enslaved people flee bondage in the decades before the Civil War and challenge the very roots of American slavery. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

In the 1830s, abolitionism became a political force to be reckoned with. In the face of harassment and mob violence, Black and white abolitionists staged rallies, published newspapers, and flooded Congress with antislavery petitions. Increasingly, they made up the rank and file of the Underground Railroad. But pro-slavery forces emboldened kidnappers to roam the streets of northern cities, hunting for fugitive slaves and free Black people, many of them children. In New York City, Black activists fought back with a radical new self-defense organization. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

On the morning of April 16th, 1848, dozens of Washington, D.C. slaveowners woke up to find that their slaves were gone. The previous night, 77 enslaved men, women, and children had quietly run away and boarded a ship docked in the Potomac River. It was the largest single escape attempt by enslaved people in American history. And it sparked riots in the streets of Washington and heated battles in government. Slaveowners and their allies in Congress grew more determined than ever to stem the tide of fugitive slaves. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

This episode comes out for free on 02/28 and is available early and ad-free for Wondery+ subscribers. Sign up on http://wondery.fm/applepodcasts and stay up-to-date on the latest new podcasts and more from Wondery. In December 1850, Harriet Tubman saved three family members from an auction block in a daring rescue in Cambridge, Maryland. It was the start of one of the most legendary careers in the annals of the Underground Railroad. Underground activists like Tubman faced enormous danger under the newly passed Fugitive Slave Act. But they refused to accept a law they deemed unjust. In the 1850s, they brazenly defied slave hunters and federal officials, sparking a series of violent clashes.

February 19, 197 CE. Septimius Severus' victory at the Battle of Lugdunum finally establishes him as the sole ruler of the Roman Empire. You can listen ad-free in the Wondery or Amazon Music app. Or for all that and more, go to IntoHistory.com History Daily is a co-production of Airship and Noiser. Go to HistoryDaily.com for more history, daily. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

In December 1938, a team of German physicists achieved an astonishing scientific breakthrough: they split the nucleus of a uranium atom. In the United States, news of the discovery sparked fear in the scientific community. Atomic fission could power a devastating new weapon, and Adolf Hitler’s Germany had a head start. In response, President Roosevelt launched an unprecedented mobilization of American science and industry. The race was on to assemble the team that would design and build the first atomic bomb. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

In Spring of 1943, hundreds of scientists and technicians moved to a remote location in the mountains of New Mexico to work at a secret laboratory. Under the guidance of their leader, J. Robert Oppenheimer, they rushed to figure out how to channel the power of an atomic chain reaction to create a bomb. Meanwhile, secret plants in Tennessee and Washington sprung up overnight to produce the uranium and plutonium that would fuel the weapon. But the leaders of the Manhattan Project faced another challenge: how to keep such a sprawling enterprise hidden from enemies and prevent the designs from falling into the wrong hands. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

In Spring of 1945, the tides of World War 2 turned. Germany surrendered to the Allies, but Japan vowed to keep fighting. To prevent further casualties, America knew they would have to demonstrate their power, and force Japan to surrender quickly. At Los Alamos, J. Robert Oppenheimer and his team raced to get ready for the first physical test of an atomic bomb.  But as the scientists grew closer to seeing their creation in action, new questions arose about how, and if, such a powerful weapon should be used. Unleashing their creation might deliver a critical turning point in the war, but could also open the door to a dangerous and complicated new era for humanity. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

Following the success of the Manhattan Project, the U.S. sought to develop a potentially more powerful and deadly weapon – the Hydrogen Bomb. Despite having led the team at Los Alamos, J. Robert Oppenheimer became an outspoken opponent of the H-Bomb. His stance made him enemies who sought to undermine his influence, and soon his security clearance came into question. Today Lindsay is joined by Pulitzer prize-winning biographer, Kai Bird, to examine Oppenheimer’s life, and eventual fall from grace. His book, American Prometheus: The Triumph and Tragedy of J. Robert Oppenheimer, was the basis for Christopher Nolan’s film, Oppenheimer. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

January 22, 1879. After years of displacement, the northern Cheyenne, led by Chief Morning Star, face off against the U.S. Army in an attempt to return to their ancestral lands. You can listen ad-free in the Wondery or Amazon Music app. Or for all that and more, go to IntoHistory.com. History Daily is a co-production of Airship and Noiser. Go to HistoryDaily.com for more history, daily. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

In February 1826, 17-year-old Edgar Allan Poe was a promising student at the University of Virginia. But within a few months, gambling debts forced him to abandon his studies. It was just one of many setbacks Poe endured in a life marked by financial struggle, alcoholism, and personal tragedy. But Poe launched a remarkable career in writing, helping to establish American literature with a bold, new voice. From short stories including “The Fall of the House of Usher,” to the poem that made him famous, “The Raven,” he transformed the horror genre by delving into the dark recesses of the human subconscious and pushing the boundaries of fiction and verse. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

In 1840, eight-year-old Louisa May Alcott moved to the small town of Concord, Massachusetts with her family. There, she spent her days wandering through the woods, putting on plays with her sisters, and learning from famed writers and philosophers such as Henry David Thoreau and Ralph Waldo Emerson. For years, Alcott struggled to achieve success as a writer. Then in 1868, she drew inspiration from her youth to write her beloved coming-of-age novel Little Women. ​​By exploring the aspirations and challenges faced by young women, she defied 19th century norms that sought to confine women in both life and literature. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.