> tanks and bombs and jets and nukes are kept in states though

We're talking about a military coup in the United States, which is a big topic, but technically, very few tanks and bombs or jets or nukes are in states. In part, for this reason. They're on federal property. States have militias; the U.S. has aircraft carriers and cruise missiles. If a secessionist government tried to invade federal territory, I would be wholly in favor of a decisive (if compassionate) military response.