Focus on Central Europe
Why and how did the breakup of Czechoslovakia occur? What are the political, economic and social relations between the two countries like?
The question of dividing a nation-state into its constituent parts is a challenging problem. We saw this in the breakups of Yugoslavia and the Soviet Union. The US fought a terrible Civil War in order to preserve the integrity of the nation and many of Vladimir Putin's machinations are motivated by the desire to "restore the greatness" of the USSR. Some background below: