What are 2 causes of the Mexican-American War?

A border dispute over whether Texas ended at the Nueces River (Mexican claim) of the Rio Grande (U.S. claim)

An attack on American troops by Mexican soldiers in the disputed area between the two rivers on April 25, 1846.

The Unites States annexation of Texas in 1845.

Explanation:

a because i tried to vote with just my college id and the answer was no

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.