What did west africas trade to north africans in exchange for salt

New communication technologies, improved transportation, and advanced military weapons made it possible for countries to speed up acquiring territory. rule large amounts of territory. fight off competition from opposing nations. expand their economies, which aided in conguest.

The economic crash that began in 1929 was called the great recession, great depression, great slump, great revolution

Why do you think americans were so fascinated by this idea of the united states stretching from “sea to sea”? give 2 reasons