[tathougies]

States make pacts all the time, without federal congressional oversight.

https://en.wikipedia.org/wiki/Interstate_compact

In Virgina v Tennessee, in 1893, the Supreme Court allows states to make compacts in all matters reserved to the states and the enforcement of which does not encumber federal rights.

And for the most part, at the consent of Congress, states keep armies and air forces (and many keep navies) as guaranteed by the second amendment.

[akiselev]

At this point in time though, who's to say the courts won't just let the commerce clause creep in its scope? It'll be pretty easy to argue that these lockdowns interfere with interstate commerce.