All of the following men explored the mississippi except
1. de soto
2. marquette
3. le salle
4. champlain

The correct answer is 4. Samuel de Champlain didn't explore the Mississipi.

Explanation:

Samuel de Champlain was a French explorer and administrator. He made several explorations in what is today eastern Canada and the northeastern United States, helping to open North America for French fur trade and founding the city of Quebec.

His first trip to North America was in 1603, as he sailed along the coasts of New England and Acadia and mapped the Saint Lawrence River. In the following years he participated in attempts to found colonies at Saint Croix Island in the Bay of Fundy and Chatham on Cape Cod. He founded a settlement at Quebec in 1608. He explored the Riviere des Iroquis (today the Richelieu River), mapped Lake Champlain and traveled along the Ottawa River. Via Nipissing Lake, he reached Lake Huron. From 1620 onwards he devoted himself mainly to administration.

what are local authorities doing to fix the problem

explanation:

b. native americans them