How did Gao acquire American citizenship?

Investment immigrants got American citizenship because they became famous and made a lot of money.

Nowadays, the rich have dual nationality. Because of dual nationality insurance, I can't get along at home and can live abroad.

Otherwise, there will be no big moves after Gao became famous. People do nothing. With their initial fame, they are hosts and visiting teachers. To put it bluntly, it doesn't matter what they earn.