Yes. The United States was an Allied Power.
During WWII, yes, Canada and Russia were both part of the Allied Forces.
Nigeria
Scotland was part of the Allied Powers during World War 2 .
Switzerland was neutral during World War 2.
There were over a hundred countries that were not part of World War I.
The Triple entente England France Russia
It was part of soviet union.
The soviet Union was not neutral during World War 2, it was part of the Allied forces.
In World War I Australia fought with other countries but in World War II they were not part of the Allied Forces that conquered the Axis Forces.
The alliance was between Britain, France, and Russia. Later joined the United States during World War I.
USA was part of the Allied alliance that was fighting the Axis forces of Germany, Italy and Japan.
General Douglas MacArthur was the Allied Commander in the far east during World War 1. In addition, he was part of the Mexican Revolution, World War II, and the Korean War.