Initially, the Thirty Years War was precipitated in 1618 by religious conflicts between Protestants and Catholics in the Holy Roman Empire. But the conflict soon spread beyond religion to encompass the internal politics and balance of power within the Empire, and then later to the other European powers. By the end, it became simply a dynastic struggle between Bourbon France and Habsburg Spain. And almost all of it was fought out in Germany. Entire regions were depopulated and destroyed.
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