Answer:
The Mississippi River is the main river transportation system in the nation, and back in the Civil War, this river was even more important for transportation.
Explanation:
The North could now transport troops and supplies deep into the center of the Confederacy.
If the movie is perhaps a documentary, then it is telling you factual information of actual events (includes pictures or pictures of actual documents or events); this makes it a primary source.
If the movie is based off of real events, has factual information, but also has added information to create a well-rounded plot, this makes it a secondary source.
470,693 square miles (1.22 million km
