Well if all you need is a website to go to, then here is a great source.
http://www.aacc.nche.edu/Resources/aaccprograms/diversity/brownvboard/Pages/supremecourt.aspx
Bradford describes the natives as barbarians and savages in his description of them in his work Of Plymouth Plantation. Since I don't have the passage you need, I'm assuming that Squanto and Massasoit are different.
The rhythm of the excerpt supports the theme of the poem, because the rhythm is consistent, and Poe celebrates the simplicity of young love.
And here is why I think so...
At this point in the poem, we still don't see anything bad that is about to happen. He is just talking about a young woman whose only care in the world is to love the narrator, and be loved by him. Later on in the poem we will see why that is impossible, but here, there is still no word about that.
I hoped this helped! :)
