3 What caused Congress to declare war on Mexico?
A. Mexico's fiery declaration of war against the United States
B. Mexico's flat refusal to make the Rio Grande the Texas border
C. Taylor's heated exchange of shots with General Arista's troops
D. Polk's false claim that Mexico had killed Americans on U.S. soll
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Congress delcared war on Mexico on may 13th 1846, congress overwhelmingly votes in favor of president james k polks request to declare war on Mexico in a dispute over texas.
