How would this affect medieval German settlement in the East? It could be easier to assimilate Balts rather than Slavs, especially if they remain divided tribes rather than unifying into states. Then again, if they became Catholic much of the impetus for settlement would be removed. It's probably futile to even ask this question because I can't even begin to think about what history would look like without the Slavs.
Assuming development into anything resembling modern history a Germany from the Rhine to the Weißel (Vistula) and beyond would be even more of a powerhouse than Germany was IOTL.
Short answer for you - L-I-T-H-U-A-N-I-A, whose history shows that Balts were perfectly capable of forming and creating states on their own. Even if the western Balts ITTL met the fate of Old Prussians OTL, I think that Lithuania would form an equivalent of OTL Russia and Weichsel would be a border between Germany and Lithuania.
Perhaps a plague wipes out the Slavic populations sometime during the beginning of the Middle Ages?Also the entire question is mind wrecking. I am trying to put into use everything I learned at the Uni and the butterfly effect is just so colossal I am not sure from where to begin with.
Even finding the PoD is mindbogling.
Perhaps a plague wipes out the Slavic populations sometime during the beginning of the Middle Ages?
I smell of an early (Balto-)Prussia wank hereIn Poland and East Germany probably Balts, because they were the 2nd closest group that could likely occupy the area vacated by East Germanic tribes.
Virtually none survived by that point in time.What about Free Daco-Thracians (those who avoided Romanisation)?: