One Battalion of Georgians switched sides, there were a few countries who declared neutrality but then joined the war, there were also countries who dropped out early. But, there were no major players who switched sides.
Italy and Turkey.
Germany and the Ottoman Empire.
germany
The Allied Powers.
Japan emerged as a world power, but Germany was weak and humiliated
Great Britain and Germany were the only one countries who were face to face,what about usa
Italy sided with Great Britain against Germany in World War 1, the in World War 2 is side with Germany. But only because they were forced to.
poland,italy,belgium,switzerland
They just didn't pick a side to fight for.
The US owned the West side, the Soviets the East.
Turkey, Germany, Austria-Hungary,
The same as in World War I : the Allies consisting of the Free French, the USSR, the UK, and the other Commonwealth countries.