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The Treaty of Leipzig was a dynastical treaty that split the House of Wettin, who ruled Saxony and Thuringia into two cadet branches. One, the Albertine branch, would rule Saxony and the other, the Ernestine branch, would rule Thuringia. Wikipedia says that this: "in the long run obstructed the further development of a Central German hegemonic power in favour of Brandenburg-Prussia." We can even see this now, with two states in Germany, Thuringia and Saxony, controlling the land that used to be a united Saxony.
What if this treaty didn't happen? Would this mean a strong Saxony that would replace Prussia's role in uniting Germany?