As round number one of the World Wars began, which countries faced off against the Allies?

WWI saw a lot of the same major players and allies as WWII, but the teams switched up a bit. Italy and Japan were actually on the side of the Allies in WWII, which pitted them – along with Great Britain, Russia, France, and the U.S. – against Germany, Austria-Hungary, and the Ottoman Empire. The Great War saw nine million soldiers killed – a tragic prelude for what was yet to come.

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