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In the original defense system deployed by Zhu Yuanzhang, Judy, the prince of Yan, and Zhu Quan, the king of Ning, including Duoyan Sanwei, were mainly responsible for defending Mongolia and Jurchen in the north. After Jingnan, the north was basically undefended, and the Mongolian army entered no one's land. Judy, who was born in Mongolia (the ruler), was a famous Ming Dynasty star after Xu Da and Chang Yuchun. In Judy's mind, he still looked down on the Mongolian army. It is very serious to be beaten in the face by an army that you despise.
Judy wanted to lead the northern expedition, but Mongolia was weakened, but she dared not confront it head-on. You enter, I retreat, you retreat, I rob. Our main purpose is to make a fortune, not to cut off a few heads, and we are usually fine at home. I'm sorry I didn't rob you of a pile of gold, silver and food in your house.
Judy's dynasty was highly centralized, and all the elite troops were stationed near the capital, sending troops from Nanjing and Beijing, and the consumption was not an order of magnitude. Are you kidding if you hand over a large number of elite troops to the border guards? Chongzhen will tell you how he was eaten by a group of warlords with no bones left.
As a military strategist, Judy instinctively realized that the main threat of the Ming Dynasty came from the north. If the capital is the south, it is difficult to ensure the vitality and execution of the border guards in the long run. Only by binding border security with the lives of senior officials in Beijing can we ensure long-term security.
As for Judy herself, he has stayed in the north for nearly 20 years, and he still misses the sandstorm in the north more than the water towns in the south of the Yangtze River.
At the same time, in its heyday, the Ming Dynasty was still very rich. In the seventh year of Yongle, Judy began to comb the river and build the capital. It took 12 years before it was officially built and successfully moved to the capital.
There is also feng shui, which is not very reliable for the time being. Nanjing has been a royal treasure trove of geomantic omen since ancient times. However, after Qin Shihuang unified the seven countries, he traveled to the Central Plains and found that the dragon spirit was soaring, so he broke the Long Mai in Fangshan, Lion Mountain and Maanshan, and led the Huaihe River across Jinling, leaving the king of Jinling with nothing. So the later generations were Chen 32, Liang 55, Qi 23, Eastern Jin 102, 69, Taiping Heavenly Kingdom only 9 years, and the Republic of China was even more attractive.