WWI: U.S. Involvement (1914–1918)

Interactive timeline tracing U.S. transition from neutrality to intervention in World War I. Covers 6 pivotal events: Wilson's Neutrality Declaration, Sinking of the Lusitania (128 Americans killed), Unrestricted Submarine Warfare, Zimmermann Telegram, Declaration of War, and the Armistice. Includes escalation meter, casualty data, and Treaty of Versailles context.