None, because the United States is a
legal fiction, like a corporation, but unlike a corporation it was created without the direct consent of its supposed stakeholders (i.e. "citizens").
The discussions regarding the practical details of its inheritor states, or, better yet, the individuals who are to inherit its assets, might in fact involve water.
That popular and humorous map does not come anywhere close to accurately estimating the geographic patterns where various political philosophies are dominant. The greatest rift is not on the issue of religion, but on more substantive economic issues - capitalism vs socialism, individual rights vs "collective rights", negative rights vs "positive rights", anthropocentricism vs "environmentalism",
natalism vs anti-natalism, and so on.
Socialism, collectivism, anti-natalism, and environmentalism tend to be predominant in urban areas. Natalism is predominant in the south, as well as places like Utah. Capitalism exists everywhere to a degree, but is predominant in less religious non-urban areas. Etc.
The most straightforward
short-term solution, in addition to greater
states' rights, is
urban secession: let the top metropolitan areas, in addition to the adjacent densely-populated suburban counties, become separate U.S. states!
In the long term, however - all governments will end up on the dust heap of history, it's just a matter of time!