Thanks Ragoczy this was an interesting brain teaser.

, i have been forced to look in the strangest of places for governmemntal systems that are still effectivly the same that predate the late 1700's.

Many will make an argujment for the United Kingdom and one could go round and round on it. It's has changed in small ways many ,many times but it's basic stucture has been the same for a much longer time than the U.S.A.'s. as in having a parlimentary system based on a constitutional monarchy.

The government of the roman chatholic church however ( ie the vatican) is arguably (for some refuse to accept its status as a nation in and of itself) the only other canidate for the position of worlds oldest and predates everyone elses governments by a thousand plus years.