Final answer:
The Peace of Westphalia allowed German States to choose between Catholicism and Protestantism.
Step-by-step explanation:
The statement is True. The Peace of Westphalia, which ended the Thirty Years' War in 1648, did indeed allow German States to decide for themselves whether they would be Catholic or Protestant.
Before the Peace of Westphalia, the Holy Roman Emperor Charles V opposed Protestantism, but the 1555 Peace of Augsburg had secured the right for rulers in the empire to establish their chosen religion. The Peace of Westphalia further solidified this by granting each entity within the empire the independence and autonomy to determine its own religious affiliation.
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