Invasion

A database maintained by Tufts University shows that there have been more than 100 military interventions by the United States since 1991.

1. Foreign government intervention

1. Extraterrestrial invasion
2. Cultural invasion

1. Foreign dictatorship
2. Foreign control
3. Defence

1. Militarization of foreign policy

1. Intrusion

1. Protecting against invasion
2. Invading

1. Invasion