From which country did the United States acquire Texas?

The United States acquired Texas from Mexico through a series of historical events that culminated in the Texas Revolution (1835-1836) and ultimately led to Texas’ annexation by the U.S. in 1845. Before it was part of Mexico, Texas was originally part of Spanish territory until Mexico gained independence from Spain in 1821. The settlers in Texas, many of whom were American immigrants, sought greater autonomy from Mexican rule, leading to tensions and conflict. After winning independence from Mexico, Texas became an independent republic before being annexed by the United States. This event was significant as it contributed to the U.S.-Mexico War and the expansion of the United States westward. Thus, the correct response is rooted in the historical context surrounding Texas' transition from a Mexican territory to a U.S. state.