I don't think there's a mechanism in place for transfer of money to the government like that beyond, say, buying bonds or something, which the government is required to repay. They aren't really set up to take large donations of that nature, taxes are already intended to handle that. And an individual isn't going to be able to legally build a highway, or a school district of their own accord without governmental assistance.
And I think it's good that this is the case. It prevents America from devolving into a hundred nations led by individual warlords, we would very easily slip into something resembling Japan's Sengoku period.
It's like some unholy combination of Plague Inc and Effing Worms, I love it. But of course I would, "villain protagonist" is my favorite steam tag. I would play and probably enjoy this game.