The mechanics of expatriation FWIW: You go to a U.S. embassy or consulate (you have to be abroad to expatriate yourself). You swear a renunciation oath, sign in triplicate and leave the embassy.
About three months later, after DC lawyers agree that you're not insane nor pulling a stunt, you get a Certificate of Loss of Nationality (CLN) back dated to the day you swore the oath.
Now you're no longer an American. You may be something else - you may even be "stateless". If you want to visit the folks in Kansas, you'll need a visa (or just walk across from Mexico).
You forgot about getting a clearance letter from the IRS that requires 7 years worth of 1040s showing you owe nothing.