From what it seems, I have read this and I believe the answer to be,
"The cotton gin was one of the most amazing and tragic inventions of early America."
From my experience, I believe this is the answer because it is the starting sentence and there were no facts provided beforehand to support the claim that it was one of the most amazing and tragic inventions of early America. This answer also uses some of the basic rules of opinion statements. Such as using the term "most".
The movement, coined “manifest destiny” in the mid-1840s, justified expansion with a sense of mission and purpose, viewing American expansion as inevitable, just, and divinely foreordained.
