According to the website of the US Immigration Service, most immigrants to the United States go through the following channels:
Through family.
Through work
Through investment
Pass the life bill
Approved by the immigration court
Through political asylum or refugees
Pass the immigration lottery
Through international adoption
Violence against Women Act
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Special immigrants
And adjustment laws in some specific countries.
Among them, the special category mainly refers to descendants of Amerasians, widows, children of American citizens, and other specific groups (no one wants to be a soldier).
There is no China in specific countries.
Basically, being a soldier seems to be a civic duty, but I am a girl and don't know much about it.