I'm not sure there was an official "leader of the Allies" but the UK is probably seen as the most prominent Allied country in the war and their leaders were ...
King George V
Prime Minister Herbert Asquith (until end of 1916)
Prime Minister David George (after late 1916)
Secretary of State for War Horatio Kitchener
Other prominent countries included:
Russia
Russian Emperor Nicholas II (also King of Poland and Grand Prince of Finland)
Grand Duke (and Commander in chief) Nicholas Nikolaevich
France
President Raymond Poincare'
USA
Prime Minister (and Commander in Chief) Woodrow Wilson)
Allied forces won World War 1
State WW1 or 2
There was no single leader during WW1. Each country had their own leader.
Kaiser Wilhelm II
Lots of nations fought on the allied side of WW1. Some major ones were the United Kingdom, France, USSR, and the United States.
General John J. Pershing was the principal leader of the US forces.
The advancing allied forces took all of the German territory and the terrified German army tried to defend but were crushed by the mighty allied forces.
after ww1
Allied forces won World War 1
Germany lost her African colonies after WW1 so there were no colonies to occupy in WW2.
central powers- Germany and crew
This question actually contains the answer. For both the First and Second World Wars the victors over the Axis were the Allies.
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alliance
Yes in WW1 and WW2 the French were allied with the US.
noooooo it was in soviet side
Austria-Hungary & Turkey