Why was st. petersburg founded?

a. to effectively battle the swedish who had previously controlled the land.
b. to provide a port and access to europe.
c. to replace moscow, which had been destroyed in war.
d. to provide a military base for ongoing wars between russia and europe.

I believe at the time, St. Petersburg was founded in order to replace Moscow, which had been destroyed at the time.

Control of the Mississippi River was important to both sides during the American Civil War. The North wanted to control the river and split the Confederacy in two. The South wanted to maintain control and ensure the flow of supplies back and forth across the river.

The Mississippi became an important route for transport and trade early in the 19th century. It is navigable from the Falls of St. Anthony in Minneapolis to its mouth. Cargo ships, barges and even paddle steamers transport both cargo (grain, paper, cotton, iron and steel) and people along the Mississippi. Cities and industries have grown up along the banks of the Mississippi because it is a natural waterway fro transporting goods.