The document summarizes key events leading up to and during World War I, including factors that enabled large-scale industrialized warfare like railroads, Germany's Schlieffen Plan to quickly defeat France before facing Russia, how the invasion of Belgium drew Britain into the war, and the turning point Battle of the Marne where French forces pushed back the Germans. It also discusses new tactics of trench warfare on the Western Front and Germany's failed blockade strategy against Britain using submarines, which eventually led to US entry into the war in 1917.

1. World War I Plans Warfare Outcomes