Pfft, the Romans wouldn't have gone into guns. They weren't as in to developing new technology as Greece. Gunpowder came from China anyway, so it would be the other way round.

China was pretty much one Empire with succeeding dynasties. The structure remained pretty much the same, the language the same, territories the same and culture the same.

BigTex: 3 world wars. Napoleon's war was fought over 3 continents as well.