Answer:
On May 12, 1846, the United States Senate voted 40 to 2 to go to war with Mexico. President James K. Polk had accused Mexican troops of having attacked Americans on U.S. soil, north of the Rio Grande. But Mexico claimed this land as its own territory and accused the American military of having invaded.
Step-by-step explanation:
Democrats, especially those in the Southwest, strongly favoured the Mexican-American War. Most Whigs, however, viewed the war as conscienceless land grabbing, and the Whig-controlled House voted 85 to 81 to censure Democratic Pres. James K. Polk for having “unnecessarily and unconstitutionally” initiated the war.