Wilmot Proviso was the legislation to end slavery in the upcoming states after the mexico-american war. It was was controversial since it was rejected.
Louis XVI´s decision to summon the estates-general prove disastrous because during it, the Third Estate , representing the Commoners decided to form a National Assembly, inviting the other two Estates ( Clergy and Nobility) to join them against the King. This is considered to be the start of the French Revolution.