In 1845, newly inaugurated President James Polk made America’s westward expansion a centerpiece of his administration. Before long, the phrase “Manifest Destiny” was used to describe this growing sense of inevitability the United States would extend its territory across the entire North American continent. There was just one problem: Mexico was standing in the way.Listen ad free with Wondery+. Join Wondery+ for exclusives, binges, early access, and ad free listening. Available in the Wondery App. https://wondery.app.link/historytellersPlease support us by supporting our sponsors!See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.