In the beginning, Britain was basically fighting to defend itself all alone. There were Americans that joined the RAF, but as a country the USA did not join till much later in the war. Russia was fighting the Nazis too, but could hardly be said to be defending Britain, they were spending all their energies defending themselves. After the USA joined the war, they were the primary nation to defend Britain.
Great britain
Britain and France (APEX)
Britain has had nukes for a long time. After World War 2 the US shared its nuclear technology with Great Britain and Canada, and Britain developed into a nuclear armed nation.
Canada was part of the Commonwealth of Great Britain. Canada and Australia served as part of the British nation and therefore as member of the Allies.
All of the oceans were involved in World War 2.
Great Britain
Great Britain was named the Nation at Arms before World War 1 due to her Naval Power.
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Britain
Great britain
Great Britain
Britain
Great Britain
The United States
Britain and France (APEX)
Great Britain A+
Britain .