czechs

Hi everyone, I'm gonna ask about a very improbable alt history. How do you make Bohemia retain Silesia and Lusatia, retain its Czech culture and even make its Czech culture expand over the centuries preferably through assimilation and also make Slovaks consider themselves a Czech minority group...

Europe in 1370: https://www.deviantart.com/randaglar/art/Lithuanian-Russia-Europe-1370-411931189 OTL: Lois Anjou dies in 1382 leaving Hungary, Czech and Silesian lands united at the time under his first daughter Queen Mary of Anjou and her fiancée Sigismund Luxembourg. His second daughter Queen...

What would the ramifications of instead of putting the Czechs and Slovaks together, they put the two prosperous Slavic regions of Czechia and German Silesia together upon the end of WW1? Would Germany be outraged? How would Poland feel? What would likely happen to the Slovaks? Would...