Why was Shu exiled in ancient times?

In ancient times, the reasons for exile to Shu were as follows:

1. Sichuan's special geographical environment and unique economic status make it relatively stable in times of turmoil. Becoming a refuge for Central Plains people and a rear base in Chang 'an, the capital of China, can provide military and economic security.

2. Shu's economy is developed and it is in danger. The special geographical location and rich natural resources make it easy for Bashu to exist in an independent way.

3. Due to the harsh environment and living conditions, Shu became the exile of Qin prisoners during the Warring States Period.

In short, the reason why ancient Shu was exiled was mainly because of its special geographical environment and unique economic status, and at the same time it was difficult to manage because of its harsh environment and poor living conditions.