Lead: Beginning in April 1846, the United States, the clear aggressor, and Mexico fought a war over territory. The result was the largest U.S. expansion since the Louisiana Purchase.
Intro.: A Moment in Time with Dan Roberts.
Content: By the 1840s the United States and Mexico had achieved their independence, both by colonial wars from their European founders. Mexico, however, was in debt, had deep class-based social divisions, and suffered acute political instability. Thus, it was difficult for Mexican leaders to govern and populate the huge territory recently won from the Spanish in present day California and the southwestern United States. On the other side of the border, ambitious Americans, hungry for land and trade in the Pacific rim, were migrating westward in increasing numbers.