What french explorer sailed down the mississippi river to its basin?

René-Robert Cavelier, Sieur de La Salle (1643-1687) was a French explorer. He was sent by King Louis XIV (14) to travel south from Canada and sail down the Mississippi River to the Gulf of Mexico. He was the first European to travel the length of the Mississippi River (1682).

If he breaks the law then he had to resign from his post and so he'll lose his/her powers.