Answer:
With the end of the War of 1812, the Native Americans could no longer count on Great Britain to shield them from the flood of white settlers headed west. ... In the years after the War of 1812, new states north and south entered the Union. At the same time, America's economic engine was fueled by King Cotton
Explanation:
hope it helps
I wish I could help you on this but I am not sure any of them make sense at all because during the pax romana it was just 200 years of peace and there was wasn't as many wars so to be honest with you there is no right answer from what I learned in History.
Sorry :(
I wish I could've helped.