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.