First event leading to US's enter into WWI:<span>Sinking of the Lusitania. May 7, 1915. American gov said stop unrestricted warfare. Germans said okay.
</span>Second event leading to US's enter to WWI:<span>Germany publicly announces using unrestricted sub warfare again. January 1917. America gives second warning. Germany ignores warning.
</span>Third event leading US's enter into WWI:<span>Zimmerman. Telegram sent to mexico by germany. Intercepted and decoded by great britain. translation given to US in Feb. 1917 America begins to mobilize for war.
</span>Fourth event leading to US's entrance in WWI:<span>April 1917. German U-boats sink four US merchant ships. America enters the war April 6 1917.</span>
Land loss. The Dawes Act ended Native American communal holding of property (with crop land often being privately owned by families or clans), by which they had ensured that everyone had a home and a place in the tribe.
