Answer:
I do believe that it is 1 4 and 5
Explanation:
It can. The mexican-american war also dealt with the future of the territories that were involved like the Texas territory. Since the United States won the territories from Mexico, the new colonies wanted to be slave colonies, and the general government disliked this. There would've been fewer slave colonies if they hadn't been conquered.
Improved transportation greatly affected farming since it allowed vital resources to be quickly shipped to the farmer, and for the farmer to export his goods far more easily to locations further away.
The doctrine that allowed people living in the territories to decide the issue of slavery through their governmental bodies was called popular sovereignty.
