Oil, Natural gas production, timber, agriculture, and ranching.
I know one cause was because he wanted to find India
Answer:
American settlers were taught by Native americans how to trade and how to farm crops. American settlers later took the land away from Native Americans and out them on reservations
The best explanation why the area between Spain and Gaul was not part of the Roman empire until that later period was a culmination from both undesireability and difficulty in accessing this region due to its mountaineous nature. So I would wager the answer being both C and D - undesireability and difficulty in access.
