Before World War I, European countries included Virginia, Albania, Spain, Portugal, Austria-Hungary, Netherlands, Britain, France, Germany, Russia, Switzerland, Italy, Greece, Serbia, Bulgaria, Rome, Belgium, Luxembourg, Denmark, Sweden, Norway and Ottoman Turkey.

The first world war was from the end of 19 to the beginning of the 20th century, when the capitalist countries were in their final stage, that is, imperialism, which triggered a wide range of irreconcilable contradictions. Colonies and semi-colonies in Asia, Africa and Latin America were basically divided up by the great powers.

Against the background of intensified contradictions between old and new colonialism, unbalanced economic development of various imperialists and unequal division of order, a world-class imperialist war broke out to carve up the world again and compete for global hegemony.

The course of the war is mainly the battle between the allies and the allies. The German Empire, the Austro-Hungarian Empire, the Ottoman Empire and the Kingdom of Bulgaria belong to the allied camp, while the British Empire, the Third Republic of France, the Russian Empire, the Kingdom of Italy and the United States of America belong to the allied camp.

Extended data:

After the outbreak of World War I, the war was mainly fought on the European battlefield. The western front of British, French and Belgian troops against the Germans and the eastern front of Russian troops against Austria-Hungary and the Germans are the main fronts, in which the western front played a decisive role.

The first world war was an imperialist war, and the imperialists shared the spoils unevenly, which was unfair to both warring parties. Although Serbia is fighting to defend its sovereignty and independence, the war it is engaged in has the nature of just national liberation, but this cannot fundamentally change the injustice of the whole war.

References:

Baidu Encyclopedia-Europe