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Just what it says: After Germany declares USW in 1917 the US accepts it as a legitimate act of war and stays neutral
BTW: This isn't ASB. In OTL, 50 Congressmen and 8 Senators voted against the war with another 6 Senators abstaining. That number would soar without the Zimmerman telegram and rise a lot higher if the Americans believed that the Zimmerman telegram was a British trick. USW doesn't stretch the law of the sea that much and would be considered lawful if the German blockade around the British Isles was deemed "effective"