A collection of statelets that hate each other and go to war every few years?

I don't see a legislative fix to our current impending collapse. The current US government is captured by globalist secret societies. That's not going to change. Separate states where genuine fascist/dissident movements might actually capture government power is at least a hopeful scenario. If Commiefornia attempts to go to war with Idaho or Utah so be it. I doubt they will.

Or a clean White-POC Cold War style split with each side trying to unite the land by force?

The POC side would be led by Jews and would be mostly incompetent. The only danger would be if they had help from outside countries or used nukes. Both of which are not really any more scary then watching the country simply collapse as we stand by and do nothing. We must develop a political alliance, a plan and then actually do something or the train of demographics and degeneracy is going to run over all of us.

And what happens to the Nuclear arsenal?

I'm not sure exactly what happens but to be honest I think the central banking families use nukes as a scare tactic. A balkanization event might help dissidents learn more about the real size and strength of the US nuclear arsenal. The intelligence community will also need to be purged. I doubt any aspect of the US and Israeli spy network is salvageable. These people are too invested in globalism/satanism and the elimination of white ethnostates.

Military installations?

I'm not really concerned about the installations themselves. If most quality white soldier defect to the white ethnostates then the old installation are a minor problem because they will be staffed with incompetent POC. New military installations can be built in the ethnostates. New alliances formed. Alliances based on history and blood not Jewish fabrications and worship of mammon.

Who gets control over what resources and shipping lanes?

This is a very genuine problem. If the US goes through a balkanization period we will temporarily weaken as world leaders which will create a power vacumn that could be filled to nations hostile to us. I don't really care though. The current situation in the US is untenable and will inevitable lead to our death as a race if we don't address it soon.

It feels so out there that it’s hard to imagine. We’ll see in a few years I guess

Most of the things going on in 2022 would seem out there to anyone from 10 or even 5 years ago. Balkanization doesn't seem that bizarre. It has happened in eastern Europe. Every other route to power seems firmly closed to us.