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20th century
Two opposite alliances were created in Europe: the Triple Entente and the Triple Alliance. The Triple Entente was created by Britain, France and Russia, the Triple Alliance was created by Austria -
1914
The first world war started when Franz Ferdinand was assassinated by a Serbian student in Sarajevo. Austria, then, declared war on Serbia, and Russia and France went to Serbia's aid. -
1915
Italy entered the war. -
1917
The Russian army retreated, and the United States entered in the war in Allied Forces' support ,after Germany has launched submarine attacks on American ships. -
1918
The war has ended. -
1919
The victorious nations took part in a summit, Germany and Austria were considered to be responsible of the war, so they were excluded form the summit.