what was the major reason for united states entry into world war 1
World War I In January 1917, Germany resumed unrestricted submarine warfare, realizing it would mean American entry. The German Foreign Minister, in the Zimmermann Telegram, invited Mexico to join the war as Germany's ally against the United States. In return, the Germans would finance Mexico's war and help it recover the territories of Texas, New Mexico, and Arizona.[150] The United Kingdom intercepted the message and presented it to the U.S. embassy in the U.K. From there it made its way to President Wilson who released the Zimmermann note to the public, and Americans saw it as casus belli. Wilson called on antiwar elements to end all wars, by winning this one and eliminating militarism from the globe. He argued that the war was so important that the U.S. had to have a voice in the peace conference.[151] After the sinking of seven U.S. merchant ships by submarines and the publication of the Zimmermann telegram, Wilson called for war on Germany,[152] which the U.S. Congress declared on 6 April 1917.
Economic nationalism While the coining of the term "
American Revolution Support for the conflict had never been strong in Britain, where many sympathized with the Americans, but now it reached a new low.[72] King George III personally wanted to fight on, but his supporters lost control of Parliament and no further major land offensives were launched in the American Theater.[65][73]
World War II In November 1939, the United States, who were taking measures to assist China and the Western Allies, amended the Neutrality Act to allow "cash and carry" purchases by the Allies.[103] In 1940, following the German capture of Paris, the size of the United States Navy was significantly increased. In September the United States further agreed to a trade of American destroyers for British bases.[104] Still, a large majority of the American public continued to oppose any direct military intervention in the conflict well into 1941.[105]