The fact that, of all places, some of the World's largest Empires arose out of An Impoverished steppe north of China, a rainy resource-starved Island in Europe and a bunch of rebelious colonies descended from the afformentioned rainy island (although theese get less ridiciolous IN THAT ORDER when you think about them).
And speaking about these colonies they even managed to keep themselves as united and survived yet one civil war. And expanded across of large continent only in couple generations.