During the Thornton Affair, both Mexico and the United States were already hostile towards each other. Skirmishes between American and Mexican troops at the no man's land along the US-Mexico border were used as a pretext to invade Mexico. If you have to perform a conscience test, the truth is, the US lusted for the lands west of the Louisiana, especially California; any pretext was good to start a war.
Nobody. Both territories were considered war booty after Mexico lost the Mexican-American War (1846-1848).
From 1846 to 1848.
1846
It was in 1846.
1846-1848.
On 13 May 1846, the US congress declared war on Mexico. Mexico never declared war on the United States.
1846 - 1848.
It was from 1846 to 1848.
In 1846, the U.S. invaded Mexico in the Mexican War. The war resulted in the United States annexation of Texas, New Mexico, and California.
The Mexican American War.
1846
1846