The most important reason why united states needed a national court system was that

i think it was so that one court controlls all the other one so that if someone does something really bad they can send them to the national court

*heiwjeh

explanation:

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hello!

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".

hope this