For non U.S. students, the question about making friends is one that always comes up and is important to both sides. For non U.S. students, being open and friendly is imperative. A simple, "Hi, my name is ..." helps enormously as students usually respond. Get to know the students who sit around you in each class, in the lunch line or at lunch if there is time, and be sure to join an after school activity. In most other countries, after school activities are not run by the school. In this country most of them are part of the student school spirit. I think this is the easiest way to find other friends as they like the same activity you do. As for keeping friends in the U.S., the ideas are much like any other country. Stay in touch, remember important dates such as their birthday, use Skype or some other media contact, and friendship stays alive. Neglected, it falls into disuse and disappears. Having had several exchange students in my home, just keep in mind that it takes time to feel comfortable; don't give up and keep a smile on your face.