In addition to a naval blockade off the Mexican coast, American forces invaded and conquered New Mexico, California, and parts of what is currently northern Mexico. Another American army captured Mexico City, forcing Mexico to agree to the sale of its northern territories to the U.S. Territorial expansion of the United States to the Pacific coast was the goal of President James K. Polk, the leader of the Democratic Party. However, the war was highly controversial in the U.S., with the Whig Party and anti

A) Expansionists supporting the war
B) Isolationists opposing the war
C) Federalists advocating for peace
D) Loyalists remaining neutral