Why did Zhang Zuo Lin choose Zhang Xueliang as his successor? Is it the iron law of feudal society?

At that time, Zhang Zuolin chose Zhang Xueliang as his successor, mainly because of China's traditional thought. In ancient feudal society, there was a system, which was the eldest son inheritance system. Only children born to wives can inherit their own careers. So at that time, this system also influenced Zhang's thought. In ancient feudal society, it was not their talents but their own status that determined the heirs. You know, in ancient feudal society, the eldest son generally had the right to inherit. At that time, Zhang Xueliang was Zhang's eldest son. He is Zhang's first 1 son and was also born to Zhang's wife. Therefore, unless Zhang Xueliang does something out of line, Zhang Zuo Lin will completely veto Zhang Xueliang. Otherwise, Zhang Xueliang is destined to inherit Zhang's career. So at that time, Zhang Xueliang was Zhang's heir from birth.

Zhang has many troops under his command, so he is very popular in the northeast. He was very arrogant at that time, and the reason for this was mainly because he had a large number of troops in his hand. If he didn't have so many soldiers under his command, he might be an ordinary man. At that time, Zhang himself knew that all his officers had their own selfish interests, so if they wanted to suppress these officers in the chaotic times at that time, they must have a very reliable helper. At that time, Zhang thought Zhang Xueliang was his helper. Zhang Xueliang graduated from the Northeast Army at that time, so since he graduated, a group of people around him began to choose to follow him. It was because he was very powerful at that time that with the follow of these brothers, he was able to gain a foothold in the Northeast Army. Another reason why Zhang Xueliang can become Zhang's successor is that Zhang's other sons are very young. Therefore, Zhang can only transfer the identity of the heir to Zhang Xueliang.