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alternatehistory.com
OTL the brothers Ernst and Albert first ruled Saxony together. Then in 1485 the Treaty of Leipzig divided Saxony into two different states. The rest is history as they say...
This historians call the biggest mistake in Saxon history. It helped the raise of Brandenburg-Prussia for sure.
What could have been achieved if the brothers would have continued ruling together, making it a house law that the electorate could not be divided?