CHRONOLOGY

• – U.S. Marines occupy Veracruz, Mexico.
• – Archduke Franz Ferdinand is assassinated.
• – Austria-Hungary declares war on Serbia.
• – Germany attacks Russia and France.
• – Great Britain declares war on Germany.

• – German U-boat sinks the Lusitania.

• – Pancho Villa attacks Americans in Mexico and New Mexico.
• – Wilson is reelected.

• – Zimmermann telegram is intercepted.
• – United States declares war on Germany.