Origins of Czechoslovakia
The creation of Czechoslovakia in 1918 was the culmination of the long struggle of the Czechs against their Austrian rulers and of the Slovaks against Magyarization and their Hungarian rulers. == Early history == The ancestors of the Czechs and the Slovaks were united in the so-called Samo's Empire for about 30 years in the 7th century.
Source: Wikipedia — Origins of Czechoslovakia (CC BY-SA 4.0)