Why do you choose to study in United States?

As is known,the American education system is the most mature,so many famous universities and research institutes in the world,to provide high quality,provides the high quality course,course table for foreign students.Can I get a better chance to do research,with celebrity interested in me.In addition,the United States is my dream,because I want to experience more,also want to know about their culture.
I hope you will be satisfied with.