The document discusses key details about World War 1, including when it took place from 1914-1918, the major countries involved, and why the US initially did not join. It then explains the key events that eventually led the US to enter the war in 1917, such as German submarine warfare and the sinking of passenger ships. The document also summarizes how the war impacted the US through changes like women filling new jobs and the post-war push for women's suffrage.