I have a recurring sci-fi fantasy in which I am given access to some amazing alien tech, including nanoprobes that allow for 10x normal human intelligence, strength, durability, etcetera. I manage to develop a product called the E.G.G. -- the Energy Generation 'Gizmo' -- that seems to create electricty out of nothing (although in reality it uses differences in the 3rd and the 4th dimension to create the electricy). Armed with this 'total energy solution', and claiming the planet Mars as the Free Nation of Mars, I build a fortune in Earth Dollars, and also terraform Mars. Citizens are allowed entry into Mars, but brain-scanning before citizenry is permitted will make it so that Mars weeds out any Communists, militant Islamics, or One-Worlders and Globalists who are set on sabatoging this new "America".
I'd write one hell of a Constitution and Bill of Rights. One right I believe was missed, was the right of privacy. I'd also change the 2nd Amendment to allow civilian ownership of ANY military weapon in current or past use. Yes, nuclear weapons too. However, scanning technology might let us know you had a 20 kilotonner in your shorts before you even got to the airport.