One thing that started the war between Mexico and the United States was most Mexicans being unhappy about Texas being annexated
Some American settlers were angry at Mexico for forcing them to leave their homes in Calofornia, still a Mexican territory at that time, and refusing to pay for the damage done to their businesses and properties there.
When President James' mission failed, he sent troops to protecit the new U.S. state, only to find Mexican troops camped along the Rio GrandeI
The U.S.-Mexican War is also known as the Mexican-American War, or just the Mexican War
Most Texans were somewhat delighted to join the War. They was it as a chance to repay their old rival Santa Anna for all of the suffering that they had experienc during the revolution