As the manifest destiny is a belief that states it was God's will that Americans spread over the entire continent, and to control and populate the country as they see fit. in fact, it was used before civil war to validate the acquisition of continental territories like oregon, for example.This is the central idea that the author suggests by Cordilia's ideas in her letter.
I think you mean nullification. It was the idea that individual states could nullify federal laws if they felt like it.
No don’t give them credit because you can change things on Wikipedia so it’s not really real facts and you shouldn’t sue Wikipedia anyway because it’s kinda like a scam it’s not always real facts