Which war resulted in the acquisition of Texas by the United States?

The acquisition of Texas by the United States directly resulted from the Mexican-American War. This conflict, which lasted from 1846 to 1848, stemmed from the desire of the U.S. to expand its territory and the contentious issue of whether Texas, which had declared independence from Mexico in 1836, should be annexed by the United States.

During the war, American forces successfully captured key Mexican territories, including the capital, Mexico City. The Treaty of Guadalupe Hidalgo, signed in 1848, formally ended the war and led to Mexico ceding vast portions of its northern territory to the United States, including present-day California, Nevada, Utah, Arizona, and New Mexico, as well as recognition of Texas as part of the U.S.

In contrast, the other wars listed did not pertain to the acquisition of Texas. The War of 1812 involved conflicts with Britain and focused on issues like maritime rights and trade, while the Civil War was rooted in issues of slavery and states' rights and ultimately did not involve territorial expansion. The Spanish-American War, fought at the end of the 19th century, primarily dealt with the U.S. emerging as a colonial power after fighting Spain and focused on territories like Puerto Rico,