The first reason is that they live in different environments. During the Zhang period, they all relied on their own efforts and exchanged their lives for power and power. Different from Zhang Xueliang, he was paid special attention by Zhang since he was a child and wanted him to be the heir of the Northeast King. But Zhang Xueliang does not have Zhang's courage and courage. When Zhang Xueliang came to power, it was during the Japanese invasion of China. If Zhang and the Japanese army hadn't lingered for so long, I'm afraid the Japanese army would have launched a war long ago.
The second reason is that Zhang Xueliang gave up the three northeastern provinces because of his misjudgment. Zhang Xueliang was a playboy since he was a child. He is bohemian and loves freedom. Naturally, he is not as talented and resourceful as his father. Because Zhang Xueliang was accused of giving the three northeastern provinces to the Japanese in vain, Zhang Xueliang recalled that year in his later years and did not want to mention it again. Later, because Chiang Kai-shek was unwilling to resist Japan, Zhang Xueliang, Yang Hucheng and others launched a mutiny, forcing Chiang Kai-shek to unite against Japan.
After the incident, Yang Hucheng was killed by Chiang Kai-shek and Zhang Xueliang was under house arrest by Chiang Kai-shek until his later years. During this period, Jong Zhang Xueliang never regained his prestige. When Zhang Xueliang regained his freedom, Zhang Xueliang had become a white-haired old man. Zhang Xueliang, a lean son, will not be reconciled to this situation.