Gavrilo Princip's assassination of Archduke Franz Ferdinand of Austria and his wife, Sophie, occurred on June 28, 1914. This event sparks World War I.
The Zimmerman Telegram
Germany invades Belgium, officially beginning World War I.
The US Enters the War
A German submarine sinks the passenger liner Lusitania. The ship carries 1,198 people, 128 of them Americans.
Treaty of Versailles
The Zimmermann Telegram was a secret diplomatic communication that proposed a military alliance between Germany and Mexico. If the United States entered World War I against Germany, Mexico would recover Texas, Arizona, and New Mexico.
Hey Mexico ;)-Germany
The United States joins the Allied Forces (France, Britain, Russia) to fight against the Central Powers (Germany, Austria-Hungary, Bulgaria, the Ottoman Empire) in World War I
The treaty redivided the territory of the defeated Central Powers, restricted Germany's armed forces, and established the League of Nations. It left Germany resentful about what it considered a vindictive settlement while not sufficiently restricting its ability eventually to rearm and seek forcible redress.