If a Machiavellian genius were to set out to destroy the United States, he would do three things. Disarm and weaken our military so it cannot defend us against foreign enemies. Disarm the National Guard so it cannot defend the States against the federal government. Nationalize and militarize law enforcement by weaponizing bureaucrats.
That version of the U.S. would be helpless, governed by a tyrant, and without a cultural or moral core. It would soon cease even to faintly resemble the country bequeathed to us by the Founders.