Answer:
It is a Natural, real number, integer
C. petroleum.
There is a whole wikipedia page dedicated to the petroleum industry of Azerbaijan.
yes, America could still in fact get a large territory. They could get it by force (war), Buy the land, or a treaty. The bigger question however, is it worth doing it. If America wants to get the land by war that just adds to what the're doing in the middle east, and if it's a neighbor next to them (Canada or Mexico) the blood shead could be high because of pupulated cities. As for money or a treaty it wouln't be that much of a risk but it depends on how much money and the details of the treaty.