How did the U. S. gain the land in the Southwest?

Much of area had been a part of New Spain and Mexico until the United States acquired the area through the Treaty of Guadalupe Hidalgo in 1848 and the smaller Gadsden Purchase in 1854. ... While the region's boundaries are not officially defined, there have been attempts to do so

calvin taught his followers that human beings needed to follow strict rules to overcome their nature and do good. second choice

answer; i believe the correct answer is benjamin harrison;