The correct answer to this open question is the following.
Although you did not specify the time in history or any specific context, we are going to assume that you are referring to the US imperialistic role through history.
Being that the case, we can comment on the following.
The foreign policy actions of the United States reflect selfish, imperialist ambitions since the times of President James Polk and the Manifested Destiny. He expanded the US territory acquiring the Mexican northern states after the Mexican-American War.
Since those years, passing through the times of President Monroe and the Monroe Doctrine and President Theodore Roosevelt and his Roosevelt corollary, the United States has always had interventionist purposes as part of its foreign agenda.
Nobody has granted the US the right or role to be the "big brother" who was looking after the interests of the western hemisphere. That is why the US has had many problems throughout history in the Middle East, Latin America, Europe, and other regions.
One of the main reasons the the French colonies in North American were unlike British colonies is because the French were far more interesting in engaging in the fur trade, while the British were more concerned with territorial expansion.
The correct answer is the United States
He used to live in France for a good part of his life, but when his wife died and world war 2 was beginning, he went to the United States where he held classes and remained there. He lived in the United States until his life ended at 88 years old from heart failure while he lived in New York. Although he did visit USSR during his life in the US, he never remained in USSR.
A cube is not a polygon because polygons are 2-d figures on a plane, and a cube is 3-d