The reason is actually very simple. Since the Eastern Zhou Dynasty, the northern part of China has been the frontier position against the northern minorities. And history also proves to us that for the Central Plains dynasty, the northern defense line is related to the survival of the dynasty. The Huns marched into Rouran, Turkic, Xianbei, Qidan, Jurchen and Mongolia during the Qin Dynasty. Almost the north has been at war with ethnic minorities. The constant war has tempered the brave and ruthless character of northerners and is more suitable for the front line. Because it is close to the front line, northerners join the army and the probability of going to the battlefield is greater than that of the south, so the probability of becoming famous soldiers is naturally high.
On the other hand, the south has been at peace for a long time. Even in troubled times like the Southern and Northern Dynasties, the Five Dynasties and Ten Kingdoms, the South was rarely affected by the war. The replacement of the Song, Qi, Liang and Chen Dynasties was also achieved through a moderate court coup. People living in a peaceful environment are naturally not interested in war, but are more willing to develop culture. Therefore, after the reunification of the country, the northern old railway fought for decades, and it was too difficult for you to let him participate in the imperial examination. Therefore, in the Ming Dynasty, due to the failure of northern scholars in the imperial examination in the south, there was a North-South list in the Ming Dynasty, that is, southern scholars and northern scholars were admitted separately in proportion.
Of course, this matter is not absolute. Yuan Chonghuan in the south is also a big star, and Di in the north is also a big official. As for the Yellow Emperor in Shaanxi, before the Song Dynasty, Chang 'an was the capital of many dynasties, so many emperors were buried there after their death.