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.
No, Serbia was not part of Russia during World War 1. Serbia was an independent country that was allied with Russia during the war.
There were over a hundred countries that were not part of World War I.
It was part of soviet union.
The soviet Union was not neutral during World War 2, it was part of the Allied forces.
The Triple entente England France Russia
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.
USA was part of the Allied alliance that was fighting the Axis forces of Germany, Italy and Japan.
The alliance was between Britain, France, and Russia. Later joined the United States during World War I.