What role did regional differences begin to play in the early republic?

where is the section with the question?

answer; i believe that the correct answer is (c) arctic tundra;

the right answer is the end of world war ii

after the end of a global wwii all the nations involved, in an attempt to create an organization to maintain world peace. this agreement would work settling international disputes via negotiation and arbitration instead of leading the issues escalate to another war.

the answer is definitley b!