The Underground Railroad was a network that secretly helped slaves escape to freedom by guiding them along stations at safe houses and churches run by abolitionists. Harriet Tubman escaped slavery herself and then returned 19 times to lead over 300 slaves to freedom through the Underground Railroad. White northerners and southerners opposed abolishing slavery due to economic concerns - northerners relied on southern cotton and workers feared job competition from freed slaves, while southerners defended slavery as essential to their economy and way of life.