The allies were not on their knees when the US entered and joined the war. France's army was still functioning in sorts after their disaster at the second battle of the Aisne, and the French armys mass mutiny also but the British and Empire troops were fighting, holding and winning at Messines, Passchendaele and Cambrai and by the Spring offensive of 1918 the British Empire and France were holding and winning at the third Aisne and 2nd Marne, yes US took a victory at Belleau wood to their credit, but their biggest asset of WW1 was morale in their presence.
But the main reasons the Allies took victory was the Royal navy and BEF and all Empire troops throughout the campaigns in the world, also the French armys sacrifice at Verdun, also Italy deserve a share of the credit, but if America hadnt joined WW1 the British Empire and France would of filled the gaps, there was still plenty of fighting campaigners to call upon, having said that the American sacrifice is excellent and i thank them as i do all the allied soldiers of WW1. Lest we forget.
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The allies were all of the super-powers such as the US and most major European countries. The allies also had many more countries on their side and Germany had very little help from the Axis powers. The Germans could not take on all of the allied countries because most of them were well developed for the time of the war.
When the Us joined the war, the newsoldiers were sent to the Western front. Where they and the French lead a series of attacks against the Germans. They pushed Germany back off France. And soon Germany called for an armistice (and end to fighting).
http://en.wikipedia.org/wiki/World_War_I#Allied_victory:_summer_and_autumn_1918
See "main articles" on there also. (My quick reply, not in detail)
The Allies won on the Western Front, because Germany was fighting a war on two fronts, which is very difficult to win. The Us>s joining the war also helped.
After World War I, the Allies gained the disarmament of Germany. Their win also let democracy spread to several European countries.
The allies were desperate as the German force threatened to overwhelm all of Europe. Additionally, the Soviets needed the creation of a "Second Front" to relieve pressure on the eastern front. Without a successful operation, the allies may not have been able to get all the necessary supplies and troops into Mainland Europe.
The U.S. were part of the Allies.
The Allies won WWI because they outlasted the Central Powers. We must remember that the Central Powers fought a two-front war for practically the entire duration of the war. Resources were thin near the end, so they had to call it quits.
The Allies win the war by securing the help of the US. This gave them a great numerical advantage over the Central Powers who had had the edge for most of the war.
The allies were able to mobilize resources because various allies focused their technology on making some weapons that they were best able to. Some made tanks while the British focused on making cruisers and frigates.