An acute angle is less than 90 degree ;)
Communism did take over I believe
The terms often used to describe the United States' position or rank in the international system is hegemon, hegemony, or super power. All of these words signify the idea that the U.S. following the fall of the Soviet Union became the most powerful state in the international system thus signifying its rise to hegemony or super power status in that no other state could match its military and economic strength.
The process by which businesses or other organizations develop international influence or start operating on an international scale.