I am more hopeful in the future because i feel that are new president is going to turn things around and make things a lot better for everyone :)
I believe the answer to be C. checks and balances
When the United States annexed Texas, the Mexican government decided to cut off diplomatic relations, resulting in the Mexican-American war, in which the Americans defeated Mexico.
The answer is B, my friend. The Carolinas and Alabama got smaller in the cause of this.