How to change nationality in Yulong Zaitian?

In "Yu Long Zai Tian", the immigration officer in the royal city can choose to immigrate to other countries, but there is a certain fee for immigration. It costs 300 ingots of silver to transfer to an empire (emperor's country), 100 ingots of silver to transfer to a powerful country, and 30 ingots to transfer to a normal country. Silver, the 1D ingot of silver in the weakened country. What needs to be emphasized here is that silver is not tied to silver. So you need to be careful when changing countries. This is also a balancing and protection measure in the game. If a country becomes a strong country, then the weak country will be even less able to survive. The weak country has some weak country tasks.