On May 8, 1846, United States and Mexican troops clashed on the prairie of Palo Alto. The battle was the first in a two-year long war that changed the map of North America. Palo Alto Battlefield National Historical Park preserves the site of this notable battle and provides an understanding of the causes, events, and consequences of the U.S.-Mexican War.

The park enjoys the unique distinction of being the only National Park Service unit to interpret the U.S.-Mexican War.