James K. Polk added more than one million square miles to the United States, True Ralse

True! James K. Polk, the 11th President of the United States, played a significant role in the territorial expansion of the nation during his administration from 1845 to 1849. Under his leadership, the U.S. acquired a staggering 1.2 million square miles of land through actions such as the annexation of Texas and the Oregon Treaty, which settled boundaries with Britain, as well as through the Mexican-American War, which resulted in the acquisition of California and New Mexico. This expansion had lasting effects on the United States, shaping its political landscape and contributing to the debates over slavery that ultimately led to the Civil War. Polk's presidency is often viewed as a pivotal chapter in America's manifest destiny, as it illustrated the belief in the nation's right to expand across the continent.