isolationism

A national policy of abstaining from political or economic relations with other countries.

The doctrine or policy of minimal participation by one’s country in international economic and political relations, specifically by not entering into alliances or other international agreements, in order to avoid becoming entangled in foreign wars, and to be able to devote the nation’s energies primarily to advancing its own domestic interests.

A national (or group) policy of non-interaction with other nations (or groups).

a policy of nonparticipation in international economic and political relations