In 1846, the United States declared a war that would reshape the North American map
In 1846, a border dispute between the United States and Mexico escalated into a full-scale war that ultimately transferred more than half of Mexico's territory to American control.
The United States officially declared war on Mexico in 1846 following a skirmish in a disputed zone between the Rio Grande and the Nueces River. While the conflict began over the annexation of Texas, it quickly evolved into a campaign for westward expansion.
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