How long were american involved in world war 1

The U.S. was in World War 1 for 1 year, 7 months, and 5 days. Although, for the vast majority of 1917, America was figuring out their Draft and manufacturing runs. American troops didn't start arriving in large numbers on the Western front until February-March of 1918.

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according to the passage the most suitable options are two. the first one is "by leading the aef to victory in several key battles" like the battle of saint- mihiel and the battle of cantigny mentioned in the passage you copied here. the second one is "by the aef and allied forces defeat germany" since the passage says that his army destroy the german resistance in the meuse- argonne offensive. and also, "by insisting that the aef operate as an independent force".

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