There's a Utah state legislator who is going back to the State compacts to pry the Federal Government's claws off the land in the states. He says that the state compacts required the Federal Government to turn the land back to the states. That would be a good start, get back to the Free Soil movement. How would Illinois like to split Chicago off as a separate State? Let the liberals have their Communes in Detroit, New York, Chicago, etc. See how that works for them.
Per the federal constitution, you can not break apart a state without the permission of the government of that state. it has happened twice at least: Maine was created from part of Mass. and W.Virginia was created from part of Virginia (Virginia reverting to territorial status because of its attempt at insurrection).
Texas was admitted by federal statute, and claimed land that eventually became parts of New Mexico, Oklahoma, Colorado, and Wyoming. Those boundaries were set by federal government, and that may not meet the terms of the annexation statute, which said that Texas had the right to break up into as many as 5 states. I figure at least 4 of the new Texican states would be in the (R) column.