The correct answer is D) It served as a transportation route allowing French explorers access to the area.
The Mississippi River was important in the early history of Louisiana because it served as a transportation route allowing French explorers access to the area.
The Mississippi River has always been a strategic place in the history of the United States. For the Native Americans, for the French explorers, in the different wars in the colonial times, in the Revolutionary War or in the Civil War, the Mississippi has been an important river for transportation purposes.
For the French explorers, the Mississippi connected the port of New Orleans with the northwest part of the territory. It represented a good way to transport people and trade goods such as the fur trade.