USA HISTORY

Detailed explanation-1: -The northern economy relied on manufacturing and the agricultural southern economy depended on the production of cotton. The desire of southerners for unpaid workers to pick the valuable cotton strengthened their need for slavery.

Detailed explanation-2: -The North wanted to block the spread of slavery. They were also concerned that an extra slave state would give the South a political advantage. The South thought new states should be free to allow slavery if they wanted.

Detailed explanation-3: -In general, the conditions of slavery in the northern colonies, where slaves were engaged more in nonagricultural pursuits (such as mining, maritime, and domestic work), were less severe and harsh than in the southern colonies, where most were used on plantations.