Can I immigrate to the United States to study for a Ph.D.?

Studying for a doctorate is still a long way from immigration. Of course, the most important thing is to get through graduation before looking for a job. As others say, you can apply for a green card after working for 5- 10 years. But if you are high-tech (maybe a little dangerous) or have outstanding achievements, this time can be shortened. Of course, it is the fastest time to get married.