Isolationism is a foreign policy which combines a non-interventionist military policy and a political policy of economic nationalism (protectionism). In other words, it asserts both of the following:

1. Non-interventionism – Political rulers should avoid entangling alliances with other nations and avoid all wars not related to direct territorial self-defense.

2. Protectionism – There should be legal barriers to control trade and cultural exchange with people in other states.

Isolationism is not to be confused with the non-interventionist philosophy and foreign policy of the libertarian world view, which espouses unrestricted free trade and freedom of travel for individuals to all countries. This "libertarian isolationist" view is best defined as a policy of non-participation in foreign political relations, but free trade and affability to all people.

Noun: a friend who is usually only called upon by a friend when a more primary/prominent friend is unavailable.

Taken from the term “second string” in an athletic competition situation. In football, if the star quarterback gets injured during a play, the second string is called off the bench to replace him/her. A “Second String Friend” is essentially benched until needed, if ever.

Synonyms: Plan B, Second Choice, Secondary Friend, Benched Until Needed

foreign policy of the US throughout most of its existence, especially in the early 20th century.

simply put: don't meddle with foreign countries

related: washington's farewell address, monroe doctrine, etc.

The Founding Fathers told us to follow NONINTERVENTION you fucking idiot.