1. A; the united states captured mexico city.
explanation; the treaty was signed shortly after the fall of mexico city and the defeat of the mexican army. this was because of the united states successfully capturing and breaking down the city and the army, causing mexico to sign the treaty to return things to normal.
2. i BELIEVE it is A; a boundary dispute between mexico and the united states.
explanation; texas was previously part of mexico, to my knowledge, and after their annexation, they were no longer a part of mexico, but instead, their own “place” in the united states.