How to understand the problem of national assimilation

National assimilation refers to the phenomenon that one nation is assimilated by another under certain historical conditions. In history, there are two kinds of national assimilation. One is natural assimilation, which means that a nation has been influenced by another nation for a long time, gradually disappearing its own characteristics and assimilating to another nation. This is the trend of natural progress in historical folklore exhibitions. The other is forced assimilation, which refers to the national assimilation policy implemented by reactionary rulers, such as forcing the oppressed ethnic groups to accept the language, customs and habits of the ruling ethnic groups and change their original national characteristics. If some Han Chinese really immigrate to Persia, whether they can really assimilate the local ethnic groups depends on the specific situation. In most cases, it should be impossible, because since they are immigrants, it is impossible for most people to go, which may be just the behavior of some people. Assimilation is mostly aimed at powerful countries with large population and relatively backward culture. Isn't that what happened in China? Many ethnic minorities have different degrees of sinicization, which is the best verification.