They fought for home and had a home-field advantage. They also had knowledge of the area. They had the french on their side.
If you’re talking about the United States, I would definitely say the Southern region especially the Southeast.
Elsewhere in the world, for example in Africa, the country of South Africa has been terrible to African Americans.
I think it would be the treaty of Paris in 1763?
This came to be known as the American System developed by Henry Clay