Which treaty led to Słupsk becoming part of Brandenburg-Prussia?
Treaty of Tordesillas
Treaty of Osnabrück
Treaty of Westphalia
Treaty of Utrecht
Answer
The Treaty of Osnabrück, signed in 1648, led to Słupsk becoming part of Brandenburg-Prussia. The treaty was part of the larger Peace of Westphalia, which ended the Thirty Years' War and reshaped the political landscape of Europe.
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