isolationism

Từ điển Oxford Advanced Learner 8th

isol·ation·ism AW BrE [ˌaɪsəˈleɪʃənɪzəm] NAmE [ˌaɪsəˈleɪʃənɪzəm] noun uncountable
the policy of not becoming involved in the affairs of other countries or groups
Derived Word: ↑isolationist

Culture:
The US has often followed this policy, especially before the mid 20th century. George ↑Washington, in his ↑Farewell Address, advised Americans to avoid strong connections with other nations. The US delayed entering both World Wars because of its isolationism.