I think it may have something to do with how the US is set up. We're alot of states within a single country. So many people think of it as, well..one whole country...the states are just there to seperate different areas and make things easier to tell where people are talking about and for legislations. I think it's hard for people to seperate this from places like Africa. Which is a whole bunch of countries on one continent vs a bunch of states within one country.