Hong Kong has become a Special Administrative Region of China and has it's own justice, education, and political system (mostly). I think it would be a great idea to have several of these regions across the us to "beta test" different policies to see whether they would be good or bad. Changing a policy or law of an entire nation is hard and risky; trying these things out in special regions, where you have a known trial period, would allow much faster innovation in the political space.