At the very most we might see Hong Kong-like civil unrest or something. But I see no path for any states to assemble a standing army under the nose of the feder

At the very most we might see Hong Kong-like civil unrest or something. But I see no path for any states to assemble a standing army under the nose of the federal government. Even if they tried to use the national guard; who's to say it would be more loyal to the state than to the fed?