Question

What led the anger and protest against the system of privilages during louis 16 oldRegime

Answer 1

Hey friend here is your answer.
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First of all because of the rumors that king's army is coming to destroy the town - the people destroyed the fortress which stood for despotic powers of the king.
Then the estate general meeting in which no value was given to majority i.e the third estate.
These are main reasons for the anger and protest by people during old regime.
Hope it helps you