Answer:
United States non-interventionism primarily refers to the foreign policy which 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 which 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 period between the world wars. Due to the Cold-War subsequent to the Second World War's end, and the rise of the United States as a global superpower, its traditional foreign policy turned into a 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 Organisation (NATO). A non-interventionist policy has continued to be claimed by some American figures and people since the mid-20th century, mostly regarding specific armed conflicts like the Vietnam and Korean wars or the more recent Syrian Civil War.
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