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The Central Powers (Austria, Germany, and Turkey) had been knocking the Allied Powers out of the war, including Italy and Russia.
The US came into the war as a result of Germany's declaration of war and initiation of unrestricted submarine warfare against US shipping in 1917.
The US built a large, new army just for the purpose of fighting in Europe, the AEF (American Expeditionary Force). It arrived and was in place just in time for the German Spring 1918 Offensive in France which almost knocked Britain and France out of the war.
The German army collided with the US Army (1st Marine Division made first contact) at the 2nd Battle of the Marne. The US won a decisive victory, driving the Germans back from Paris. The German army was on the defensive for the remainder of the war, and the US army played major roles in most of the subsequent Allied victories.
In summary, the arrived with a large, fresh army at the decisive time to turn the tide from Allied defeat into victory.
What else can I help you with?
Why the Russian Revolution was the final breaking point to get the US into the war?
The Russian Revolution did not play a large part in the US government's decision to enter the War. The sinking of the Lusitannia, the Zimmerman Telegraph, unrestricted submarine warfare and propaganda played a much larger role in the decision.
How did the telegraph play a role in the US Civil War?
Lincoln often communicated with his generals via telegraphs. It was the latest and fastest way to communicate ideas and plans to those out on the battlefield
What role did the US play in World War 2?
The US provided millions of dollars in weapons, armament as well as money itself to the Allied forces. Victim, combatatant and victor, it was also called the "Arsenal of Democracy" and the "Breadbasket of the World."
How did World War 1 impact the lives of women in the US after the war?
Women began playing a large role in the workforce.
Went to jail for criticizing the us role in World War 1?
eugene debs
What role did Vietnam War play in US history?
around 1950
Did the us stance on communision play a huge role in getting involved in the Vietnam war?
It was the only role. Otherwise the US would have stayed out of it.
What event led to a decisive shift away from isolationism the US?
World War I
What event led to a decisive shift away from isolationism in the the US?
World War I
What event led to decisive shift away from isolationism in the US?
World War I
What role did Mobile Alabama play in the US Civil War?
The role of Mobile, Alabama was a significant role in the US Civil War. The city passed several resolutions even passed a resolution to succeed from the Union.
Who is John Pershing and what role did he play in World War 1?
He was a General of the US Armies
Who won the war Mexico or the US?
It was a decisive US victory. See related questions for further details.
What role of physical isolation did the US play to stay out of and recover from the war?
THE WAR? I think there has been more than one war
What role did john smith play in the Vietnam war?
John Smith is a common US name; he was a US Serviceman.
What role did the US economy play in this change of public support during the Vietnam war?
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What role did the Cubans play in the Spanish American War?
It was the Cuban quest for Independence that brought about US involvement.
