Where was the Underground Railroad the most popular?

The Underground Railroad was most popular in the northern United States, particularly in states like Pennsylvania, Ohio, and New York, which served as key hubs for escaped slaves seeking freedom. It also extended into Canada, where many fugitives found refuge from slavery. The network relied on a series of safe houses and sympathetic abolitionists who provided assistance along the routes. Overall, its most active regions were those with strong abolitionist sentiments and established networks for aiding escapees.