Winneconne, Wisconsin seceded in 1967:
In 1967, as a result of the town name being inadvertently left off the official Wisconsin road map, a secret committee formulated a plan to secede from Wisconsin, set up toll gates on local roads, begin annexation of nearby communities (starting with the city of Oshkosh) to form a Sovereign State of Winneconne, and declare war on the United States. As an alternative plan, annexation by another state, preferably one with better weather, was sought.
