Respond to one of the following topics. Use standard English. 1. How did the American nation expand its boundaries during this era? What was manifest destiny, and how did it justify American westward expansion? 2. What issues surrounded the debate on the annexation of Texas? How did the U.S. provoke a war with Mexico and what were the consequences of the war? 3. What if President Polk had not initiated a war with Mexico in 1846? Would the Southwest still be a part of Mexico? Would the Civil War still have been fought?