Declaration of Independence: The Declaration of Independence was a document adopted by American colonists in 1776 that declared their separation from British rule.
Monroe Doctrine: The Monroe Doctrine was a policy articulated by President James Monroe in 1823 that warned against further colonization efforts in the Americas by European powers.
Manifest Destiny: Manifest Destiny referred to the belief prevalent during the 19th century that it was America's destiny to expand its territory from coast to coast.