Well there is the Aloha ʻĀina Party that seeks Hawaiian sovereignty, Several Cascadian independence movements that seek to seceded the Cascadian bioregion from the US. There is the Second Vermont Republic. Puerto Rico has a few parties advocating for independence, as are parties that advocate for Samoan unification.
I’m less familiar with the federal level, but I wouldn’t be surprised to find the dissolution of the US (or at least the defederation in favor of a decentralized union) on the political left including several socialist and anarchist parties.
I’m less familiar with the federal level, but I wouldn’t be surprised to find the dissolution of the US (or at least the defederation in favor of a decentralized union) on the political left including several socialist and anarchist parties.