The answer to the question will be letter C.
The correct answer to this question is D) he was not sure the Constitution gave the president the right to purchase land.
Jefferson's main concern regarding the Louisiana purchase was that he was not sure the Constitution gave the president the right to purchase land.
Jefferson was decided to buy the Louisiana territory and sent James Madison to France to help Robert Livingstone -Minister to France- with the negotiations. The result was a successful one. The United States accepted to pay $11,2500,000 for 828,000 square miles of the Louisiana territory. The agreement was signed on May 2, 1803.
The Union used its number of ships to keep the south from exporting or importing its goods to foreign countries. It also used the ships to spread slave-revolt propaganda to convince European countries to not to trade with the South so they'll be economically weak to provide their soldiers with nessecary equipment such as weapons, food, and clothing. The union also used its wealth to buy southern loyalties to block south' sports to weaken confederates further more. Also, the North had railroads which the government bought from different companies to provide transportation to their men faster along with weapons. They also had many inventors who came up with gadgets and codes to help the army.