Quote Originally Posted by Romano-Dacis
C'mon, we imperialist Romanians have to stand our ground: it ain't a world war until we're involved!!

I wouldn't classify a world war by how or where it's fought, but more so by the results from it. As such, I wouldn't qualify the Crimean War (which resolved pretty much nothing) or the Seven Year's War (once again, no result, the maps of Europe were redrawn ante bellum) as World Wars. In my book a World War needs to involve two or more superpowers, span at least two continents, and have a decisive outcome where the balance of power is evidently shifted. None of this "but after the 7 years war Britain gained this and France gained that" crap. Unless one of the major warring parties is completely annihilated from the diplomatic field (as happened in WW1 and WW2) it is not significant enough in the global balance of power to be a world war.
You have wars that took place within a 100 square mile area that would qualify as a world war by your definition.