I think the answer is B. On the map the Canadian shield surrounding Hudson Bay seems to be the largest geographical region in Canada.
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"
They were being considered as a milestone because it means that the milsetone was being placed as a marker placed along side of the road to tell u the distance is to the nearest city.
