Answer:
1. B. veto proposed laws
2. A. commander in chief
3. I'm not sure with this one
Main cause was the black death
The Catholic Church is the reason why he got power quickly.
<span>Prior to the Mexican American war president Polk sent John Slidell to Mexico to negotiate an agreement between that the Rio Grande River would be the southern border of Texas. ... The United States annexed the territory of California in 1848 following its victory in the Mexican-American War.</span>