Czechoslovakia, formed in 1918, was an independent state born directly after the end of the First World War and the subsequent breakup of the Austro-Hungarian Empire on October 31, 1918. It was a state which included territories of what is now the Czech Republic, Slovakia and the Ukraine. The population of Czechoslovakia in 1921 was 13.6 million, out of which Czechoslovaks (Czechs and Slovaks) accounted for 64%, Germans for 23%, Hungarians for 5.5%, and so on. It was a country composed of people of many nationalities, enjoyed many spoken languages, and could be considered multi-ethnic by all means. To understand the complexities of the eventual split, it is important to understand the historical developments that took place.