The answer is A. Drove production costs up. It drove production costs down, because they were able to take less time to make the products as well as less materials because 1) standardized parts were invented around the same time, and 2) they didn't have people preparing everything so materials weren't wasted.
I think its because the first people who came here were originally close in distance (ie. most people came from England and places near England.) When we brought slaves over, the African people along with the native people to the Americas (the native Americans) had to learn to understand us to make peace, trade, and other stuff.
Secret diplomacy was a major factor based on the fact that led to fear between all the nations and confusion. Nationalism and imperialism is a factor, scramble for Africa, Archduke fradana has some ties based that his death lead to more retaliation in the Balkans which wanted to be independents do Austria-Hungary and Russia fought over for.
