What event led to a weakening of the German states in the 11th and 12th centuries?

Question

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The Investiture Controversy was a significant conflict between secular and religious powers in medieval Europe, particularly involving the authority to appoint bishops and abbots. This conflict weakened the German states as it led to internal divisions and conflicts between the Holy Roman Emperor and the Pope, undermining the emperor's authority and leading to a loss of control over the territories within the empire.

What Event Led to a Weakening of the German States