Causes of WW1

The outbreak of the First World War

The failure of the Schlieffen Plan

First day in the trenches

Why Italy joined WW1 on the side of the Triple Entente

On the 23rd May 1915, Italy entered the First World War on the side of the Triple Entente and declared war on Austria-Hungary.

USA joins WW1

Why did the USA declare war on Germany on 6 April 1917?

American President Woodrow Wilson had made his case for war before a special joint session of Congress four days earlier.