Was the period from 1815 to 1828 truly the "awakening of American nationalism" or was it the birth of sectionalism?
The label"the awakening of american nationalism"that has been attached to the years 1815-1828 is simply wrong. Those years, if anything, marked the birth of american sectionalism. In light of the following documents and your knowledge of american history, to what extent do you agree with the statement above?
From your question, it is clear that this is a DBQ and we, of course, cannot see the documents so we will not be able to help you with that.
If I were to answer this without being able to see documents, I would rely on two main things -- the Missouri Compromise and the Tariff of Abominations. Both of these fit into your time frame.
The Missouri Compromise itself, of course, did not promote sectionalism -- it tried to avoid it. But the fact that a compromise was needed shows that sectionalism had started to be a big deal during this time period.
The passage of the tariff showed that the two sections were really quite opposed to one another. It showed that the North was willing to pass a law that it believed in but which the South thought was completely contrary to their interests.
So I would start with those and then look at the documents and try to find support there.