What impact did the War of 1812 have on American society?

The War of 1812 changed the course of American history. Because America had managed to fight the world's greatest military power to virtual standstill, it gained international respect. Furthermore, it installed a greater sense of nationalism among the citizens.

the monroe doctrine is the best known u.s. policy toward the western hemisphere. buried in a routine annual message delivered to congress by president james monroe in december 1823, the doctrine warns european nations that the united states would not tolerate further colonization or puppet monarchs.