Question: Who was the first european to discover the mississippi river?
Disambiguated questions and answers: question: Who was the first European to sail upriver the Mississippi River?
Who was the first European person to discover the Mississippi River?
answer: Alonzo Alvarez de Pineda
Hernando de Soto
Natural Questions answer: Alonzo Alvarez de Pineda (from the Wikipedia article "Timeline of European exploration")