Who was the President that annexed Texas? Why was the North against this? (2-4 sentences) Who was the President during the Mexican-American War? How did the War start? (2-4 sentences)

The President who annexed Texas was John Tyler, who was in office from 1841 to 1845. The North opposed Texas annexation primarily because they feared the expansion of slavery into new territories, which would upset the balance of power between free and slave states in Congress. James K. Polk was the President during the Mexican-American War, serving from 1845 to 1849. The war started after a border dispute arose between the United States and Mexico, particularly over the annexation of Texas, leading to skirmishes in disputed territories that ultimately escalated into full-scale conflict.