The answers that apply to the question would be: John Brown's raid AND the election of 1860. The other events had already happened by the time the civil wat started.
B. AND C.
Africans were the group of people that the Europeans forced into slavery in the New World. These people came in contact with the Europeans when the naval fleets of Europe discovered Africa. They colonized most of its regions and sent off some of its people to Europe in ships. When they arrived they were sold and bought by Europeans and served as slaves for multiple households and manufacturing industries in the developing country.
