World War one, the First World War or the Great War began in the summer of 1914 and ended in 1918. It involved all of the major world powers and ended with many new European countries being formed and the establishment of the League of Nations. The war was triggered by an assassination of Archduke Franz Ferdinand of Austria, the heir to the throne of Austria-Hungary by a Yugoslav nationalist, this lead to an ultimatum between Hungary and Serbia. Each of these countries has a number of allies which were drawn into the conflict and this resulted in the First World War.
The Countries involved in the First World War
Most of world war one took place on the European and Asian continents with some battles in Africa and South America. The War was fought by two sides the Allies which included the major powers of the day France, The British Empire and Russia, and the Central Powers which included the other major empires of the time, the German Empire, the Ottoman Empire and the Kingdom of Bulgaria.
Other countries that became involved due to alliances with the Allies included the United States, Italy (who made a treaty with France changing sides in 1915), Japan, Belgium, Serbia, Romania, Greece, Portugal, Brazil, China and Montenegro. Canada, Australia India and South Africa were also involved as part of the British Empire. Other Countries that became involved as allies of the Central Powers included Austria-Hungary and Turkey.
After the war ended the German empire, the Ottoman Empire, the Austro-Hungarian and the Russian empire no longer existed due to political and military defeat. The Soviet Union rose from the destruction that was Russia and the borders of central Europe were redrawn to accommodate several smaller states.