To start or provoke a conflict or war with another country. In the context of President James K. Polk, it refers to his actions that led to the Mexican-American War.
Related terms
Mexican-American War: A conflict fought between Mexico and the United States from 1846 to 1848, resulting in significant territorial changes for both countries.
Manifest Destiny: The belief prevalent during the 19th century that it was America's destiny and right to expand its territory across the continent.
Territorial Expansion: The acquisition of new land by a country, often through conquest or purchase.