No Velvet Divorce

on New Years day, 1993, Slovakia and The Czech Republic split up into two separate nations. What would be a good background for an alternate history where they stay together?
 
They decide that they will have a larger economic weight if they stay together, but to appease nationalists they turn into a federation or a confederation. I'm not sure this would work with a unitary nation.
 
They decide that they will have a larger economic weight if they stay together, but to appease nationalists they turn into a federation or a confederation. I'm not sure this would work with a unitary nation.
Czechoslovakia was Federation since 1968!
 
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