How did NATO represent a historic change in American foreign policy?

It created military bases outside the continental United States.

It granted the United States permanent control of Germany.

It committed the United States to a peacetime alliance to defend other nations.

It departed from the principles of the Monroe Doctrine.

Question

How did NATO represent a historic change in American foreign policy?
 
   
It created military bases outside the continental United States.
 
   
It granted the United States permanent control of Germany.
 
   
It committed the United States to a peacetime alliance to defend other nations.
 
   
It departed from the principles of the Monroe Doctrine.

anonymous · Answer

it committed the United Stated to a peacetime alliance to defend other nations