ITTL you won't see the USA as a co-belligerent against Germany in "WWI". A German victory is no threat to American interests, the US and UK are significant rivals. If the RN blockades Germany with a distant blockade, like OTL the US is likely to be very pissed at its ships and cargoes being seized - basically the British called everything war material: food, clothing, medical supplies, lumber. The British blockade started before you had the Germans doing unrestricted submarine warfare that involved US ships. You also won't see the USA making the kind loans to the Entente that did OTL, which invested them in an Entente victory. I can see the USA selling to either side for cash up front, as they were not overly close to Germany either.
ITTL I can see the USA being truly pissed about the British blockade. First off it is a distant blockade, with ships stopped well away from German ports. Secondly, they would stop ships, bring them to British ports, and then go through proceedings even if they were going to neutral ports due to concerns about materials being forwarded. Finally, the list of prohibited goods was so extensive as to be all-inclusive. It is not beyond the realm of possibility for the USN to escort a convoy of ships carry goods that are not dual use (food, medicine, clothing, etc) to german ports and when the RN comes along they tell them what they have and they are proceeding...then what. Does the RN try to forcefully stop them, start a fight, and now add the USA to the list of enemies?