If the rest of the world joined the USA... what would change?

[°Leprechaun]

This is a very interesting topic. One thing that would probably change. The issue of state's rights would become much more important. Individual states would object to the world laws. Moreover, has the right of a state to secede every really been determined. That was an issue in the American Civil War. In fact, it was an underlying issue, although in many minds it was about the question of slavery.