Answer:
C sounds most accurate, however, most of the European countries were going to go to war regardless of colonies and such, the war was essentially unavoidable as everyone had gotten a bunch of new "toys" (i.e. new weapons) and as Europe does, they wanted to test them out on one another.
Explanation:
I the early 1800s most Americans still lived along the Eastern side of North America. The midwest was considered the Frontier.
The American attitude shifted in favor of rights for Native Americans. This is based on "Polls showed that Americans believed in rights for Native Americans". Why it's not A is because it wasn't the polling that contributed to the act, but what the polls showed which is C.
