World War I (1914-18)

In June 1914 Austria and Germany declared war on Serbia. Following this, France, Russia and Britain sided with Serbia. During the war a strong wave of patriotism and hatred of German swept Britain. In 1915 Italy joined France and Britain. In 1917 Russia withdrew, after Bolshevik Revolution (1917-20), but United States entered the war on Britain's side. The conflict end in 1918 with the victory of Britain, France and Italy.