<P> A national drive for territorial acquisition across the continent was popularized in the 19th century as the ideology of Manifest Destiny . It came to be realized with the Mexican -- American War of 1846 , which resulted in the annexation of 525,000 square miles of Mexican territory , stretching up to the Pacific coast . </P>
<P> A national drive for territorial acquisition across the continent was popularized in the 19th century as the ideology of Manifest Destiny . It came to be realized with the Mexican -- American War of 1846 , which resulted in the annexation of 525,000 square miles of Mexican territory , stretching up to the Pacific coast . </P>
us imperialism in the late 19th century was supported by which theory
us imperialism in the late 19th century was supported by which theory
Manifest Destiny
Manifest Destiny