World War I started in the middle of 1914 because of the assassination of Archduke Franz Ferdinand. The war went on for 5 more years, until the Treaty of Versailles was created and commanded the armies to seize fire. World War I officially ended on June 28, 1919.
I usually ask my teacher what specific things to study and although you already know what to study, they will usually tell you things that you can study that are prevalent on the test.
