Why are there fewer emperors in Henan?

There are also many emperors in Henan province. Let's compare the most familiar founding emperors, Li Yuan, Zhao Kuangyin and Sima Yan. They are all from Henan. Henan can be said to be the birthplace of talents, and another is that as the birthplace of culture, the people's living standards are still relatively good, and it is difficult to have a founding emperor without rebellion.