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America.
Antarctica was not involved in World War I, because there was no nation-state on the continent to become involved.
The United States entered the war after the bombing of Pearl Harbor.
Benito mussolin was involved it : World war one, World war two, and when Germany was attemting to take over Poland
Austria Hungary did not become one nation after World War 1.
The Americans refused the president Legue Nation
Britain
America did get involved
in 1
Russia
The U.S. became involved after the bombing of Pearl Harbor.
A country is a nation. 'Country' is the word that is used around the world. 'Nation' is a word often used in the USA.