Timeline of United States diplomatic history

The diplomatic history of the United States oscillated among three positions: isolation from diplomatic entanglements of other (typically European) nations (but with economic connections to the world); alliances with European and other military partners; and unilateralism, or operating on its own sovereign policy decisions. The US always was large in terms of area, but its population was small, only 4 million in 1790.

Source: Wikipedia — Timeline of United States diplomatic history (CC BY-SA 4.0)