Immigration is much easier. But it depends on your grades in Huada. Los Angeles and San Francisco are fine. There are relatively more choices in Los Angeles. San Francisco has Stanford and Bockelee campuses, which are among the top schools. There are California Institute of Technology, UCLA and USC in Los Angeles. If your grades are worse, you can also choose Irving University, Davis University, Riverside University in Los Angeles, and the University of San Diego further south. In addition, several branches of California State University are also quite good, such as CalPoly. In addition, there are quite a few 4-year professional schools in the United States.
After studying in China for two years, you can study in American universities for the next two years according to the transfer application. It depends on the subjects of your university in China, and then investigate which university in the United States recognizes these subjects, calculate the credits, and then apply.