The Yanks did nothing whatsoever in WWI. They sent just 1 million poorly equipped (the Yanks were given French artillery guns (the 75 and 155mm) while the British provided them with mortars, machine guns, steel helmets and some uniforms) and poorly trained troops into the war - a very small amount compared to what Britain sent - and those troops saw very little action.
In fact, the British were rather unimpressed with the Americans. The lack of speed with which the American Expeditionary Force (AEF) was sent to Europe was later criticised by British Prime Minister David Lloyd George. The 1st Division AEF landed in France in June 1917. The 2nd Division did not arrive until September and by October 31st, 1917, the AEF only numbered 6,064 officers and 80,969 men. In roughly the same time span in 1914, the British Expeditionary Force (BEF) had got 354,750 men into the field. Nine months after America declared war, there were 175,000 American troops in Western Europe. In the same time span of nine months from 1914 to 1915, Britain had put 659,104 men into the various theatres of war. Therefore, in 1917, despite her strength on paper, America played little part in the war activities of that year.
It was the British - the world superpower - who were the big-hitters in WWI. Britain won it.[
Britain bled itself dry as well as the sons of its commonwealth.
The Yanks saved the Brits.
And whilst Goring was bombing British cities, when Britain fought ALONE against the Nazis, Yank companies, such as Ford, were making cosy little business deals with Germany.
Alone... well... not really.
As the saying goes...
"England has always been willing to fight to the last American."
BOOM!
LIGHTS OUT!