Annexation of Texas: The process through which Texas became part of the United States in 1845, leading to increased tensions between North and South over the expansion of slavery.
Republic of Texas: The nation that existed from 1836 to 1845 after gaining independence from Mexico, before becoming a U.S. state.
Texas Revolution: A rebellion of colonists from the United States and Tejanos (Texas Mexicans) in putting up armed resistance to the centralist government of Mexico.