Nova Albion - Pretty much goes hand-in-hand with the Cascadia, Oregon, Republic of the Pacific comments.
Misquitia - The British protectorate over the Miskito tribe on the Caribbean coast of Central America.
Pueblo state in US Southwest that results from a more organized Pope's Rebellion.
Vermont - It wouldn't really be a break-away state if it wasn't originally part of the US.
West Florida - Actually existed.
Chan Santa Cruz - A state of the Crusob Maya along the Yucatan coast, north of Belize. It was supported by the British government at one time.
Lakotah - Some kind of Plains Indian State that breaks off from the French Empire at some point.
Illinois - French Illinois Country, lost to the British like Quebec. There was still a French-speaking population there after the American Revolution.
Something in the Old Northwest, perhaps a Native American state connected to Pontiac's Rebellion.
There's also all the places that aren't independent today that could be in some alternate world, like Greenland, Puerto Rico, Bermuda, Martinique, etc.
...That's all I have for now. I'm not sure that Deseret would count as it was part of Mexico.
Misquitia - The British protectorate over the Miskito tribe on the Caribbean coast of Central America.
Pueblo state in US Southwest that results from a more organized Pope's Rebellion.
Vermont - It wouldn't really be a break-away state if it wasn't originally part of the US.
West Florida - Actually existed.
Chan Santa Cruz - A state of the Crusob Maya along the Yucatan coast, north of Belize. It was supported by the British government at one time.
Lakotah - Some kind of Plains Indian State that breaks off from the French Empire at some point.
Illinois - French Illinois Country, lost to the British like Quebec. There was still a French-speaking population there after the American Revolution.
Something in the Old Northwest, perhaps a Native American state connected to Pontiac's Rebellion.
There's also all the places that aren't independent today that could be in some alternate world, like Greenland, Puerto Rico, Bermuda, Martinique, etc.
...That's all I have for now. I'm not sure that Deseret would count as it was part of Mexico.