Where were French explorers establishing military outposts? along the Mississippi River and around Chickamauga Lake.
along the St. Lawrence River and around the Salt Lake.
along the Nile River and around the Great Lakes.
Along the St. Lawrence River and around the Great Lakes.

French explorers were establishing military outposts along the St. Lawrence River and around the Great Lakes, in the New France colony.

Explanation:

New France was a French colonial unit in North America that existed from 1534 to 1763 with the status of viceroyalty. Its capital was Quebec, and iIts territory was made up of the colonies of Acadia, Canada and Louisiana. At its peak around 1745, it included the watershed of the St. Lawrence River, the Great Lakes, and the Mississippi, the northern prairie, and much of the Labrador Peninsula.  

The geographical position of New France prevented the westward expansion of the thirteen British colonies in North America, as well as the connection between these colonies and Rupert's Land. This led to tensions which culminated with the French and Indian War from 1754 to 1763, which ended with the surrender of New France in 1760, followed by the Treaty of Paris of 1763, as a result of which France ceded to Great Britain an important part of its first colonial empire.