What did the US call their new defensive empire?

United States call its empire a defensive one because it was portrayed as a justification to counter communism.

Explanation:

The United States imperialism was different from the European ones in many aspects. The U. S has timely justified its intervention in other countries. It considered the Western Hemisphere its jurisdiction, which should be ruled according to the American ideal of capitalism and democracy. They portrayed communism as an attack on American ideals and used imperialism as a weapon to fight against it.