I am aware of the 90/180 rule of the Schengen agreement stating that one in possession of a Schengen visa can only stay in the Shengen area (regardless of which country it is) for 90 days in any 180-day period. I am an American citizen and as such I believe that I do not need a Schengen visa to enter any of the countries comprising the Schengen agreement. That being said, I am still limited to a 90-day stay in whatever country it is, just like those who have a Schengen visa. However, this is my question:
I'm not sure if that allowance for an American citizen of a 90-day stay is unique to the country in which I am staying OR if it applies to the entire Schengen area just like the Schengen visa. For example: would I be able to enter, say, France (which is a part of the Schengen area) for a maximum of 90 days, and then travel to Germany (which is also a part of the Schengen area) for a new 90-day period?
This of course would not be possible with a Schengen visa, because the Schengen area is basically acting as a united country as far as the Schengen visa is concerned. Is this the same for the American allowance of a 90 day stay? Or can I stay in the individual countries for periods of 90 days?