Which is not a way in which us boundaries changed between 1800 and 1821?
a.
the nation doubled in size with the louisiana purchase.
b.
new england states lost territory as people moved west.
c.
the nation added new states in the midwest and south.
d.
john quincy adams arranged to purchase florida from spain.

A little late but for future reference

Just took the test.  Correct answer is

B-New England states lost territory as people moved west.

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

hope this .

plz give me brainliest!