Forgottonia
Shears' map shows each and every attempt at secession along with the boundaries these movements intended to set up, including Independent Long Island, which would've severed it from New York, and South Florida, which would've protected Miami from the rest of the state (smart move). Then there are those that partially, or temporarily, saw success: Like the State of Franklin, which existed for four and a half years before collapsing and being re-admitted to North Carolina in 1789 after failing to protect or support itself economically.
And considering the havoc wreaked by states like Franklin, we're lucky that so few of them succeeded. Of course, then there are more selfish reasons to be glad for the map that is today. Imagine having to memorize 74 more state capitals in grade school.