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Thirty Year's War
It happened when the King of Bohemia attempted to urge Catholicism throughout the territory he had. During the Thirty Year's War the Catholics and Protestants fought in an international war. The wars brought in national armies such as Spain, Sweden, France, Denmark, and Habsburg Dynasty. The Thirty Year's War was important, it changed the geopolitical face and religions in society. https://www.history.com/topics/reformation/thirty-years-
