For the Louisiana purchase question, it more than doubled the size of the united states. As for the second question I believe the answer would be "Thomas Jefferson was eager to explore the west to ensure the survival and prosperity of the United States"
To protect the Spanish territory from the French :)
the answer is B The West has a variety of climates and many different biomes.
Because back then they had slave and none slave states and they had to matin that because each state had a someone to go and say what they want and they thought that if there were one none slave states that they would end up getting Reid of slaves they they kept it even