Communists and liberals idealized the First Czecho-Slovakia (1918-1939), but this was not any democracy, nor fair state. After a long time of monarchy people even didn't know what the democracy is. The system of the First Czecho-Slovakia was full of corruption first of all, e.g. the land reform in Slovakia had to give the grounds to poor Slovaks who wanted to farm and grow vegetables on them, but the Czech, or rather Prague's free-masonic government gave the grounds to their much-favoured persons who were Jewish in many cases. This is why the Slovaks feel such aversion to the so-called Czecho-Slovakia.
Yeah, at least.. Czecho-Slovakia was glued together only by the Communist force. After the (managed) collapse of Communism in 1989 The Czech and Slovak Federative Republic arose, but these two countries were not able to stay in the common state any more. Czechs said that the Slovaks slowed down economic development and Slovaks said that the Czechs didn't take care of Moravia and Slovakia. So they splitted up, though Moravians stayed in common state with the Czechs (interesting that there was a petition for joining new Slovakia. Now Moravians are almost definitely Czechised).