The formation of the North Atlantic Treaty Organization (NATO) in 1949 is a significant event in United States diplomatic history because it

Acommitted the United States to a peacetime military alliance.
Bstrengthened United States influence in oil-producing nations.
Ceased tensions with the Soviet Union and its satellites.
Dcreated new patterns of international trade.

Verified Answer :

The correct answer for the question that is being presented above is this one: "a. committed the United States to a peacetime military alliance." The formation of the North Atlantic Treaty Organization (NATO) in 1949 is a significant event in United States diplomatic history because it committed the United States to a peacetime military alliance.