With colonial power in 1898, the United States' role in the world changed to that of isolation and expansion. There are three main US ideologies that contributed to the change of the role of America in the world, Manifest Destiny, the Monroe Doctrine and the Open Door Policy. From the time of President Washington, Americans have believed in the theory of manifest destiny. "Manifest Destiny was the idea that it was the obvious destiny of the …showed first 75 words of 432 total…

…showed last 75 words of 432 total…Africa, it became a power that the Old World was made to listen to. "The Old World also had to acknowledge that the United States would make itself listened to if its interests were at stake." (http://www.fortunecity.com/ victorian/picasso/50/amcenBII4.htm). With the new century approaching and the ideological theories of Manifest Destiny, the Monroe Doctrine, and the Open-Door Policy the United States now fit into the definition of a world power.