Is this a good thesis?

I agree with the first poster. The first sentence comes off as very opinionated. If you removed the word backstabbing and replaced it with a more "neutral" word. It would flow a lot better. I would also break up the first sentence. You could subtly interject some of your feelings within the body of the thesis, but it is imperative that you remain as neutral as possible. The first sentence of any paper has to be the most riveting. Here is where you capture your reader's attention.

Now if this thesis is subjective, then your first sentence definitely fits the bill.

What are your body paragraphs going to be about, because right now it sounds like they'll be about backstabbing caused pain on the trail of tears and caused them to lose their land, and how treaty breaking caused pain on the the trail of tears and caused them to lose their land. Can you write an essay with only those two components?

That second thesis is sound; it promises a scholarly presentation of Cherokee society: its governance, its customs, its beliefs, its use of resources, etc. In short, was the society viable if left unmolested?

Incidentally, if your are writing a paper, not an item of propaganda, you must present your finds from the most impartial perspective possbible.

No. It is too short, and it contains the judgment you are trying to prove. Further, it uses personalized words such as backstabbing. Be more factually descriptive and less judgmental. Make the facts speak for themselves, let the reader come to the judgment you have already arrived at.

Agreed. Though, I may be a little biased because I'm part Cherokee ;)