isolationist

One who believes that a new race or variety cannot become fixed or established through natural selection unless its representative individuals are locally or topographically separated or segregated from the remainder of the species.

In recent United States politics, an advocate of the policy of non-interference or non-participation in international affairs.

A proponent or supporter of isolationism; one who is isolationistic.

of or pertaining to isolationism.

Favoring or supporting isolationism; — of people.

Of or pertaining to isolationism or an advocate thereof.

One who advocates or supports isolationism.

an advocate of isolationism in international affairs

of or relating to isolationism