The underground railroad was a series of homes and safe-houses slaves used to escape north to Canada or other states. It lasted from 1800 to 1865 and some conductors helped the slaves escape north. There was a famous conductor called Harriet Tubman who helped thousands of slaves escape to freedom. However, these underground railroads were illegal, so if they were caught they would either be brought back or killed, even. Many of the people in the northern states found out the slaves were entering the north, but some even let them go and escape because they were abolitionists, people who hated slavery and wanted to abolish it. Soon, many new laws and treaties enforced that they must bring slaves back to the owners, and violations often led to the death penalty. The Underground railroad soon was abandoned and the civil war began. Harriet Tubman served the Union as a Nurse, Spy, and Cook.
The Underground Railroad was in the times of a national slave trade. This is where slaves were captured, but those who were free or running away typically at night would hide out in houses up in north Canada Harriet Tubman lead them… I hope this helps
