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Which treaty freed the electors of Polish vassalage for the Duchy of Prussia?
Treaty of Bromberg
Treaty of Xanten
Peace of Westphalia
Treaty of Saint-Germain-en-Laye
Answer
The Treaty of Bromberg, signed in 1657 during the Second Northern War, freed the electors of Polish vassalage for the Duchy of Prussia and also gained Lauenburg-Bütow and Draheim for Brandenburg-Prussia.
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