Answer:
During the Reformation, a number of princes converted to Protestantism. Although there had been religious conflicts in the sixteenth century, the Thirty Years' War was an extended, brutal conflict. The war began in 1618 when the Catholic Emperor, Ferdinand II, tried to enforce religious uniformity on the Empire
Explanation:
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World War I killed more people (9 million combatants and 5 million civilians) and cost more money ($186 billion in direct costs and another $151 billion in indirect costs) than any previous war in history
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