The Dred Scott decision made by the US Supreme Court in 1857 led to the Civil War because it stated: a. Slave owners had to pay slaves a fair wage

b. a slave in a non-slave state was considered free

c. slaves were property and had no constitutional rights

d. dred scott should be free and given protection in the north

How did european exploration and expansion cause the african slave trade to expand? a. european explorers discovered the slave trade and expanded it across the indian ocean into south asia. b. arab armies captured european explorers and forced them into slavery. c. european traders shipped enslaved africans to work on plantations in european colonies in the americas. d.european explorers captured african people and forced them to work on their ships.