There are various ways in which to approach this topic. One simple but persuasive way is to start your essay with a general statement on the importance of education and then narrow it down to speak of traveling to the United States to obtain an excellent education. Bear in mind that you should offer a few cogent supporting reasons why the United States is a great place to study. So, for example you can start the body of your essay in the following way:
There are few things in life as important as education. A good education not only unlock a person's mind, but also allow that person to life to his or her full potential. In addition, in this competitive world, education will be the primary way to get ahead and stay competitive. In light of this, it is reasonable to get the best education possible. In this essay, I will argue that a great place to go to gain an excellent education is America.
The above is meant to be a sample. You will have to supply the reasons. You can even take a different route altogether. The great thing about essays is that you can be creative.