The small Manchu Qing state, which lost the Ming Dynasty to hundreds of thousands of people, is not rigorous, and it should be the internal turmoil of the Ming Dynasty that caused the Manchu Qing to "go down the mountain to pick peaches". During the Chongzhen period of the Ming Dynasty, there were about 100 million people, the Manchu Qing population was only a few hundred thousand, both sides were mainly agricultural economies (the Manchu Qing also had a fishing and hunting economy), there was no difference in military technology, the gap in comprehensive national strength was basically reflected in the size of the population, people produced more grain, more soldiers, under normal circumstances, the Ming Dynasty could not lose to the Manchu Qing. The failure of the Ming Dynasty should find more reasons from itself, limited by space, and simply talk about the key points.
At the same time, due to the collapse of the weishu system at the end of the Ming Dynasty, almost all the soldiers that the Ming Dynasty could use were recruited by the conscription system to pay high salaries to the soldiers from Zhejiang, Guangdong and the southwest region, such as the Battle of Salhu, which determined the strategic strength of the Ming Dynasty and the Manchu Qing, and the Ming government also smashed pots and sold iron to gather 80,000 soldiers.
The ming soldiers were of a very low status, in the words of a Spaniard, in a disgraceful slave position, because the first had no personal freedom, and the second soldiers had to be called as state serfs, paying huge land gifts to the state every year, and from time to time being pulled by the old wives to be called free labor. At the same time, due to the blessing of fine traditions such as drinking soldiers' blood, the poor share of the sergeant's land was occupied by the commanders, and the poor salaries of the soldiers had to be withheld by the chiefs at all levels, and the amount of money issued to the hands was insufficient, and it would be owed for months or even a year before it would be issued.
Although it is said that the later Chongzhen destroyed the castration party, his own appointment and deployment of talents was not reasonable enough, and he did not believe in people, and he also "scraped" Yuan Chonghuan, the only one who was a little level at that time, and since then the Ming Dynasty has been completely at a disadvantage in Liaodong. Later, the Ming Dynasty perished in a vigorous peasant uprising, and the Qing Dynasty took advantage of the void to seize the fruits of Li Zicheng's victory and successfully conquered the Central Plains.