Mexico Texans Sam Houston Anglo settlers in Texas Anthony Burns runaway slave gold San Francisco Zachary Taylor "conscience Whigs" Free Soil Party Know-Nothing Party westward expansion Oregon Trail James K. Polk General Antonio Lopez de Santa Anna Alamo Mexican War Stephen Douglas Compromise of 1850 Wilmot Proviso Manifest Destiny Fugitive Slave Act Treaty of Guadalupe Hidalgo "one big reservation" Native Americans "higher law" William Seward "Fifty-four forty or fight!" Oregon Texas Revolution Tejanos "Mr. Polk's War" "Popular sovereignty" 49ers Free Soilers Personal liberty laws Ostend Manifesto Cuba