How did America's stance on WWI change over the course of the war?

Despite sympathies with Great Britain, France and their allies, the United States stayed neutral in the first years of the war. ... When the United States entered the war in April 1917, the U.S. Army had only 130,000 troops, no tanks and few planes. Congress quickly approved conscription to strengthen the forces.

Explanation:

America had a stance of neutrality in 1914.  But in 1915 a movement declared that the U.S needed a much stronger army and the best way to achieve it would be entering WW1. In 1917, Germany sensed the tide was turning. German leaders agreed in January of 1917 to resume unrestricted submarine warfare to break the devastating army stalemate in Europe and the British navy’s successful blockade of critical German supply ports. This pushed American public opinion toward intervention. Germany’s unrestricted submarine warfare sent more ships to the ocean’s floor and the loss of American lives spiked. The U.S. protested and in February 1917 severed diplomatic relations with Germany, while Congress approved funds for increased military affairs. On April 2, President Wilson asked Congress to declare war against Germany specifically citing Germany’s renewed submarine policy as “a war against mankind. It is a war against all nations.” He also spoke about German spying inside the U.S. and the treachery of the Zimmermann Telegram.

On April 4, 1917, The United States went to war.

Explanation:

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