Changing state borders requires assent by the state legislatures involved as well as Congress.
> Changing state borders requires assent by the state legislatures involved as well as Congress.
With respect to Congressional approval, apparently all that is necessary is for the respective state delegations to jointly declare for the Congressional Record the adjustment to state borders. This has been going on for a long time for adjustments due to natural changes and resurveys. In the 19th century whole counties were swapped.
I think if this keeps up one of the coastal counties will turn and put the possibility of an Idaho coast on the table. This would be especially beneficial to Idaho.
However if we could convince people California and Oregon denied equal representation or similarly screwed the voters, they would lose representation in Congress and potentially become territorial possessions again, which could be divided up into new states without worrying about the former state legislatures or congressional delegations.