When Li Zicheng immediately captured Beijing, why did he ask Chongzhen to be king in the northwest?

I think that when Li Zicheng immediately captured Beijing, the reason why he asked Chongzhen to be king in the northwest may be because:

1、? Justified? , the second Tang Gaozu

Li Zicheng is a symbol of the peasant war in the late Ming Dynasty, but it is undeniable that he has many historical limitations, so that is to say, he also has the limitations of the peasant uprising army in that era, that is, the peasants fought against the landlords, but in the end they directly became dragons! Therefore, Li Zicheng proposed to Chongzhen that he should be the king of the northwest, not because he didn't want to be the emperor, but because of this, he could make full use of the ultimate legitimacy of the Ming government. Put yourself in a dilemma!

You know, after the siege of Chang 'an, Tang Gaozu entered Chang 'an directly as a peasant army supporting the new emperor. Then, after gaining a firm foothold and having both offensive and defensive skills, he kicked out the worthless Yang Emperor. Therefore, that is to say, Li Zicheng can also get such benefits by imitating Tang Gaozu's ci. You know Tang Gaozu has the knife! The emperor became the puppet of the King of Northwest China, and Li Zicheng couldn't agree! ?

2, unite with the majority, give face.

To say the least, if Li Zicheng fails to attack Beijing, it will be obstructed by a third party or other changes will take place. I can also use the northwest king of the Ming Dynasty as a legal separatist party, and judging from the events of later historical development, how many people in the surplus army of Dashun chose the Nanming camp! Moreover, if he succeeds in becoming the Northwest King of Ming Dynasty, he will leave a certain face for Emperor Chongzhen of Ming Dynasty, make him become the nominal head of state again, and finally make way for glory. ?

At the same time, we also know that there were two Beijing systems in the Ming dynasty, and the fall of Beijing does not mean the demise of the Ming dynasty forces. Therefore, it is natural that Li Zicheng, the king of Northwest China, was sealed by the emperor and made the emperor a vassal! Now, if Li Zicheng encounters a collision with other forces in the future, such as the Battle of the Eight Banners in Manchuria, he can still have two identities!