European and Western culture, due to a variety of factors the relative importance of which are the subject of debate but I personally believe to be chiefly geographic, certainly dominated the world in a way that had never been seen before. From modest beginnings, European culture now dominates 4 continents and has made significant inroads into the other 2. It was only until the 20th century that the torch was passed to North American and Eurasian outlier civilizations, and both we more-or-less highly derivative of Europe. And it's only in the 21st century that the bases of power are beginning to move gradually back to Asia, although that end result as yet is by no means a definate result.
So, the challenge is, with a PoD after 1500 (to make it difficult), keep the period of European dominance of the world as short as plausibly possible.
So, the challenge is, with a PoD after 1500 (to make it difficult), keep the period of European dominance of the world as short as plausibly possible.