How did the Revolutionary War change the middle ground between 1763-1815? [HINT: Explain the Americans desire for land.] Include Info about: Why did some Indian tribes side with the English and some with the French? How did England plan to deal with their new middle ground? What impact did the "new" immigrants have on the backcountry? How did the new United States government deal with the Middle Ground? How did the drive for opportunity shape the middle ground after 1800?