The number-one cause of American involvement in the Great War was unrestricted submarine warfare by the Germans. After the sinking of the Sussex in March of 1916, President Woodrow Wilson threatened to rescind all diplomatic relations with Germany unless the submarines stopped firing on neutral vessels. All the Germans had to do was bomb another ship, and that happened within the first two weeks of March, 1917. (In the interim, the US was made aware of the so-called Zimmerman Note, or Zimmerman telegram, in which Germany proposed to Mexico an alliance whereby Mexico would take Germany's side against the US, with an eye to regaining territory ceded to the US).
Four unarmed merchant vessels were attacked, and American lives were lost. Before this point, Wilson had made the threat of war if Germany overtly attacked American vessels, and on April 6 final approval for a declaration of war came from Congress.
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I believe they entered WW I because U-boats were sinking their merchant ships bound for Europe.
They also got very upset because they found out that Germany was in the process of getting Mexico to ally itself with them against the U.S. in the event of a war. luckily British intelligence intercepted it and it found its way into the American news papers.
America had pursued a policy of neutrality up to the point when German submarines stopped respecting the neutrality claimed by United States merchant marine ships. When the British ship Lusitania was sunk in 1915 with over 200 American citizens aboard, the public called for an entrance to the war in Europe.
the German U-Boats were sinking all ships along the North Atlantic. Once they sunk the Lusitania, Americans were angry because there was about 100 American civilians who died.
The Americans joined because the British were winning and they wanted to be the winning team!
The Japanese American Evacuation Claims Act
The ship carried 120 Americans and its name was the Lusitania.
The alliance between Germany, Italy, and Japan
The Japanese-American citizens were compelled to enter into what were essentially concentration camps for the duration of the war ~ see related link below .
The Russians pushed from the East. The Allies pushed from the North and South.