He ends up back at the starting point because if he walks the same steps forwards and backwards he would be in the same spot
The French had set up trading posts in the Louisiana Territory and traded goods using the Mississippi River as transportation. The river leads into the ocean, specifically in New Orleans. New Orleans was a major port used to transport goods from the Louisiana Territory back to Europe.
Mainly Slavery, Missouri was admitted as a slave state
I think that it is the Atlantic but let me know if this is incorrect...