In Maine, indigenous tribes have severed ties with the state.
There are no border guards when you cross the bridge from the tiny village of Princeton, Maine, to the Indian Township Reservation, but according to the Passamaquoddy Tribe who live there, you have entered sovereign territory.
Last week, the Passamaquoddy and the nearby Penobscot Nation both withdrew their representatives from the Maine State Legislature, citing a breakdown in relations with the state government. Read more in Hakai.