With the Battle of Palo Alto led by Mexican General Mariano Arista, what war began in 1846?

The first official battle of the Mexican-American War was the Battle of Palo Alto in 1846. The Mexican army crossed the Rio Grande and opened fire at Fort Texas. General Zachary Taylor (who would later become president) defeated the troops. Three days later, the United States, under President James Polk, declared war on Mexico.

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