Uhh, I don't think ancient roman is a good example, unless barbarism, constant expansionism, slavery and patriarchy is your thing, and I'm skipping over a lot of other fucked up shit like forced sex based on status quo. While their culture was indeed rich, they were far from being an example country.
EDIT: Even carthage, the country rome destroyed, would be a better example.
US government for 1 dollar? Count me in