yes
Technically, Serbia. However WWI is widely referred to by Historians as 'The War Nobody Won'. Austria declaring war on Serbia, the Serbs’ allies Russia declaring war on Austria, the Austrians’ allies Germany declaring war on Russia and the Russian’s allies France and Britain declaring war on Germany. America eventually entered on the side of Serbia et al due to a few incidents with German U-boats and Germany surrendered. If you work backwards operating under the system of official declarations via the various alliances the winner is Serbia (whose country was mostly pounded into gravel in the process) and their allies: Russia, France, and Great Britain.
Germany and the Allies declared an armistice during World War I due to the exhaustion of resources, mounting casualties, and the collapse of the German military front.
First, Japan attacked Pearl Harbor Hawaii on December 7, 1941. Then, Germany and Italy (Japan's allies) declared war on the USA on December 9, 1941.
America,Britain and Canada.
The Allies and the Axis. America was on the side of the Allies. Nazi Germany was on the side of the Axis.
Axis Japan (Germany surrendered May 7 1945) Allies America (with New Zealand pilots)
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america had many allies that even though did not outnumber Germany were much more well prepared and trained
Italy and japan were the allies of Germany
All of the countries who had signed the Tripartite Pact. So, as of December 7, 1941, the list was:GermanyItalyHungaryRomaniaSlovakiaBulgariaCroatia
It was the usa who joined the allies in 1917 (and not the other way around).