I'm pretty sure (1.) is A, and I know for a fact that (3.) is D because slavery was a regular practice between quarreling tribes. I have no clue what (2.) is. Best of luck.
For the very reason that us as Americans have been in this two-party system for so long that we would want to keep this tradition rather than to add another party, and oppose eachother even more. Also, voters feel that having a third party vote is irrelevant because it is less likely to be voted for and won over.