By the end of the war, Mexico would lose almost half its territory to the U.S., including lands from Texas to California. The war was a key event in American History as it fulfilled its 'manifest destiny', encompassing land from the Atlantic Ocean to the Pacific. Manifest Destiny was the dream that America should control North America from the Atlantic Ocean to the Pacific Ocean. Mexico had legal claim to Texas and owned California , Arizona, and New Mexico. ... The disagreements between the United States and Mexico over the border of Texas led to the Mexican American War. Manifest Destiny, a phrase coined in 1845, is the idea that the United States is destined—by God, its advocates believed—to expand its dominion and spread democracy and capitalism across the entire North American continent.
Mexico would lose nearly half of its territory to the United States by the end of the war, including lands from Texas to California. The war was a watershed moment in American history, as it fulfilled the country's "manifest destiny," encompassing territory from the Atlantic to the Pacific.
