The last one, "The Native Americans fought on land they knew."
Well assuming you mean America, and not considering Civil War, I would say the draft of the Constitution Thomas Jefferson want to make slavery illegal, but he needed the southern states approval.
The biggest one is speculation on the market. Many would buy stocks on margin, say only meeding 10% of the share amount to buy a share of stock. So great quantities of stock were able to be bought without necesarily having the money to legitimately purchase them.
Answer:
I think in the 10millions