Divided USA? I hate to break it to you, but we are united on NOTHING. There are two countries occupying the same land - with NOTHING in common.
Everything these days is polarized - abortion, immigration, economy, defense, etc. Czechoslovakia proved it could split peaceably and survive. It is past time for a split; let’s find out which side of the issues is right. But then, we know the answer.
No, they didn't. All that happened there is that they got transferred from one empire to another. The Slovakian government has fallen for the second time in five years, due to the EU's meddling (not that the EU treaties allow national governments too much autonomy anyhow).
Czechoslovakia proved it could split peaceably and survive