Thirty Years' War
The Thirty Years' War was fought from 1618 to 1648. It was fought primarily in Germany, but several other countries became involved in the conflict, including France, Spain, and Sweden. In fact, almost all of the powerful countries in Europe were involved in the war, which began as a fight about religion between Protestants and Catholics. As the war continued, the Catholic Habsburg dynasty and other countries used the war to try to get more power. For example, Catholic France fought for the Protestants, which made the French-Habsburg rivalry even worse.