War Part 1: In the picture above is the Mexican war of independence. Mexico has been in many wars in the past, but this one was one of the most important. The mexican war of independence was a movement for what Mexico used to be called, New spain. Mexico was one of the first countries to fight against Spain. Spain wanted Mexico’s territory, but Mexico didn’t want to give that territory up to Spain. So they went into a war from 1810 to 1821. So they went into a war from 1810 to 1821.