You'd be surprised how many stamps have major map errors. One classic goof is the above US stamp commemorating the 1803 Louisiana Purchase. Unfortunately, the map does not show 1803 Louisiana accurately. Back then, the territory went above the 49th parallel-- meaning the familiar straight-line border at the top of the USA is wrong. Plus, this map includes the bottom of Alabama and Mississippi, (known then as West Florida) as a part of Louisiana. The US didn't acquire that land until 1819. Oops! For a big list of other map mistakes on stamps, visit this site.