The United States Navy began it's participation in WWI on April 6, 1917. This happened inmediatly after the declaration of war on the German Empire, after more than two years and a half of president Woodrow Wilson trying to keep the US out of the war.
The main focus of the US Navy was to convoy supplies and men to France and Italy, and to counter-attack enemy U-Boats in the Atlantic and Mediterranean seas. U-Boat stands for 'Unterseeboot' which literally means 'Undersea Boat'.
Very few decisive submarine maneuvers took place because of the US late entry to WWI, and the main ships from the navy never really engaged the German Empire fleet.
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The immediate cause of this was because they wanted to undo the german revolution (1918-19) it was the so called governments “resolution” to force demobilization of *free corps*
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Native-born Americans who saw the influx of new immigrants to the United States with concern were called Nativists.
In the late 1800s, due to the huge entry of immigrants in America, a lot of anti-immigration feelings came forward. A huge effect on immigrants coming to the U.S. appeared in nativism. Nativism is a policy when people show favoritism toward native-born Americans.