Why did the US and UN send troops when North Korea attacked South Korea? to create an alliance
to protect colonial interests
to follow the containment policy
to create a demilitarized zone

the social contract theory

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.

"germany's geographic location was an advantage when it was on the offensive in the war because it was situated next to an extremely wide river, the rhine, which was difficult for the allies to cross."