United States non-interventionism

United States non-interventionism primarily refers to the foreign policy that was eventually applied by the United States between the late 18th century and the first half of the 20th century whereby it sought to avoid alliances with other nations in order to prevent itself from being drawn into wars that were not related to the direct territorial self-defense of the United States. Neutrality and non-interventionism found support among elite and popular opinion in the United States, which varied depending on the international context and the country's interests. At times, the degree and nature of this policy was better known as isolationism, such as the interwar period, while some consider the term isolationism to be a pejorative used to discredit non-interventionist policy.

Due to the start of the Cold War in the aftermath of World War II and the rise of the United States as a global superpower, its traditional foreign policy turned towards American imperialism with diplomatic and military interventionism, engaging or somehow intervening in virtually any overseas armed conflict ever since, and concluding multiple bilateral and regional military alliances, chiefly the North Atlantic Treaty Organization. Non-interventionist policies have had continued support from some Americans even after World War II, mostly regarding specific armed conflicts like the Vietnam and Korean wars or the more recent Syrian Civil War and Russo-Ukrainian War.