The South relied heavily on steamboats for transportation of supplies and troops. They absolutely needed the Mississippi River to be effective in anyway during the war. The North also used it for transporting, but they had railroads. They were mostly concerned with keeping the South from using it.
The revolution of 1848 benefited Louis Napoleon so much. When the election for Presidency was held, he filed a candidacy and won the election which made him the President of the Republic. The revolution of 1848 meant the end of the rule of King Louis Philippe.
D) Scots; Is your answer.
escalated its troop commitment to the conflict.