How significant were the US in World War 1?

Answer 1

Short answer: Money and men. Long answer: By 1918, both France and Britain were bled dry of service aged men who were able and willing to fight. Over 8 million men had been lost in each of their armies! 16 million total! They called it "The Lost Generation" in England. British and French leadership were pleading for US involvement and men and on the brink of financial collapse. There had been mutinies in the French Army, primarily against poor leadership and supply, despite the French soldiers' tremendous effort and sacrifice. The Germans were winning as of the end of 1917!! The German intelligence service was able to deliver Lenin back to Russia to carry off the Soviet Revolution. The Russians ended hostilities with the Germans, freeing up 2 million experienced German soldiers for the Western Front. The US finally got enough troops and supplies to France and Belgium by mid 1918 in the last 200 days of the war to affect a positive result. That, the very successful Royal Navy blockade of Germany and the tremendous gains of the Canadian and ANZAC forces in the last 100 days brought the Germans to ask for a truce. The US lost 50000 men in battle, 60000 to the flu and other sickness!! Unfortunately German greed for land in Europe and their perennial hatred of the French led to continuation of hostilities in World War II wherein another 60 million died!