Isolationism means a policy of staying away from involvement or interaction with other countries and focusing on one's own country's affairs. Full definition
While I consider myself a bit of a nationalist, with a streak of isolationism thrown in for good measure, as a consumer I look to purchase goods made in America as often as possible. (myretirementplanner.info)
There has always been a strong strand of anti-European isolationism in the United States, dating back well before the First World War. (clivehamilton.com)
A victory for the Republicans may mean we are nearer the front of the queue for a post-Brexit trade deal but perhaps we can expect an element of isolationism on the part of the US going forward.» (lawyer-monthly.com)