He supported annexation by the United States and after annexation in 1845 , he became a U.S. Senator and finally a governor of Texas in 1859 , whereby Houston became the only person to have become the governor of two different U.S. states through direct , popular election , as well as the only state governor to have been a foreign head of state .
Sam Houston supported annexation by the United States . When he assumed the governorship of Texas in 1859 , Houston became the only person to have become the governor of two different U.S. states through direct , popular election , as well as the only state governor to have been a foreign head of state .