Idont have more points that 15 : ( but ! 1. what law required northerners to assist in the return of runaway slaves? a. the compromise of 1850 b. the runaway slave law c. the northern assistance law d. the fugitive slave law 2.what was the economic foundation of southern states in the mid-1800s? a. wheat b. cotton c. gold d. salt 3. what was the underground railroad? a. a series of slave catchers and southern sympathizers working to return escaped slaves b. a subway built with the purpose of city workers travel c. a network of abolitionists and safe houses arranged to slaves escape to free territories d. the route taken by slave traders after the abolition of slavery in the early 1820s 4. what name was given to the rebuilding of the nation after the