the correct answer is D
it was related to the food supply
The early humans moved out Africa when the climatic condition in the region of East Africa Rift valley,where earliest stone tools were discovered became increasingly dry. Hunting as a source of food also became scarce as animals also spread out of the region. Subsequent strains in areas where they conquered led them to migrate further across the globe.
Answer:
unemployment, poverty, population growth, and so on
Answer:
A.
Explanation:
In reality, I bet all the answers are at least partly correct.
But the reason (or excuse) that people often gave was that the voters (no black people of course!) of each state should decide if they wanted to allow slavery.
They called it 'Popular Sovereignty' and it was a twisted argument that we could use a democratic process (voting) to decide that a certain class of people would get no democracy at all, or even be recognized as having ANY rights, like the right to not be owned and murdered.
