Here are the answers to your questions:
Question 1: The Louisiana Purchase __________ the size of the United States.
Answer: B more than doubled
Question 2: Control of the Louisiana territory was important because of the port of __________.
Answer: D New Orleans
Question 3: Because he was a __________, Jefferson initially worried that the Constitution did not grant the president the right to make such a deal with a foreign nation.
Answer: D strict constructionist