Answer:
(1) Guadalupe Hidalgo
(2) Texas, California, Utah, Nevada, New Mexico, Colorado
(3) Rio Grande river
Explanation:
The best reason the United States might aid another country is to protect US interests abroad, especially when a democratic country is at risk of falling to a non-democratic one, since it is in the US's best interest for foreign nations to be democratic rather than authoritarian. <span />
