B, C (lol B, C like Before Christ xD)
Slave owners had choose to enslave Africans because servants were to expensive (also warfare and diseases had decimated native populations). And why it went on for long was because slave owners wanted to gain wealth for themselves and men primitive enough to keep slavery alive by feeding money into it as customers.
C, The armies used roads to travel quickly. Roads facilitated the movement of armies, people, and goods across plains, deserts and mountains.
Answer:
1. War of 1812
2. Oil Embargo of 1973
3. The Creation of the Bullmoose party
Explanation: