After the Annexation of Texas, Mexico broke off diplomatic relations with the United States. Soon fighting began between the Texans and Mexicans. President James K. Polk declared that the Mexicans had invaded "American territory" and that it was "ample cause for war."
Not everyone believed that the war was a good cause. Nevertheless, war did happen. The army of the U.S. was led by General Zachary Taylor, who won many victories in the war. Later, Taylor was removed from battle and brought back to America as a war hero. He was replaced by General Winfield Scott, who led the American troops to take over Mexico City by landing marines on the beaches. The war was won by the U.S. and a peace treaty was made that included the annexation of Texas.
