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What if it was in 1915 that the US had declared war on germany. Let's say the Lusitania sinking had a greater impact emotionally or it was coupled with another similar event?

Now it would still have taken the US some time to organize it's forces as in OTL but what would have been the effect of that 2 years earlier declaration? How would the battlefield have been affected by the entry of 500,000+ american troops in 1916 or so let's say?
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