The Anglos in Texas were Americans, and the only reasons they had not been annexed by the United States in 1836 were northern Congressional resistance to another slave state and a dispute with Mexico over the southern boundary of Texas. While waiting for admission, the Texans in 1839 expelled the Cherokee, Shawnee, and most of the Delaware that the Mexican government had encouraged to settle in eastern Texas to keep Americans out in the first place. Houston was re-elected president and set about repairing the damage done by Lamar's administration. He not only had to deal with Comanches, but a second war with Mexico (1841–42).