How did the shaded area on the map become part of the United States a. It was gained from Mexico after the Mexican War
.b. It was ceded to the United States by Spain
.c. It was purchased by the United States from France.
d. It was won from the British in the Revolutionary War.

I'll include the picture on the bottom

c.It was purchased by the United States from France.

Explanation:

The shaded are is the region that USA bought from France during the Louisiana purchase in 1803. At that time, USA bought it for 15 million USD. (But it's around $342 million if we convert it to current valuation.)

Considering the amount of land and resources that United States got from the Louisiana territory, this was considered as one of the best bargain that United States Government ever made in history.

answer; i believe the correct answer is norming;