3. briefly explain how social darwinism contributed to european imperialism. (2 points)

To quote the witch in Snow White "Who's the fittest of them all?" Who but those who think they are powerful enough to occupy colonies who supply raw materials to be shaped into manufactured articles, to be sold back to the colonies? 

That is the definition of imperialism. It is the colonization by force of those unable to prevent the colonization.  Imperialism is the creation of an empire by colonizing people that can't prevent their own subjugation.

Does that not sound like survival of the fittest to you?

The answer to your question would be b

In the midwest because it has more moderate climate than the north or south west which makes farming far easier.