28 jul 1914 año - Start of World War 1

Descripción:

Serbian government ordered the Serbian army to mobilize and appealed to Russia for assistance

1915, Germany declared the waters surrounding the British Isles to be a war zone, and German U-boats sunk several commercial and passenger vessels, including some U.S. ships

1919, Allied leaders would state their desire to build a post-war

Referred to as “the first modern war.” Many of the technologies we now associate with military conflict—machine guns, tanks, aerial combat, and radio communications—were introduced on a massive scale during World War I