I don't agree with all of Jared Diamond's theories, but I agree with the description of Eurasia as the supercontinent. That huge landmass gave Eurasia significant advantages over all the people of the other continents. They were not superior people; they had much more to work with than others. The advantages of Eurasia did not benefit just the Europeans; it benefited all the peoples of Eurasia. What Europeans gained during age of exploration could have been done by any of the other peoples of the continent, the Arabs, the Indians, or the Chinese. It was just luck that the Europeans did it and dominated the world for 500 years.
What's interesting, and most people don't know this is that the Chinese almost did it. At about the same time, Europeans were exploring the world in the west the Chinese were exploring from the east. The Chinese had made it as far as East Africa and had trading colonies on the shores of Africa, but then the emperor that sponsored the program died, and the next emperor canceled it and called all the Chinese back to China. If that had not happened, the history of the world could have been entirely different, and it would have been the Chinese who had vast empires in Africa.