<p>As a matter of United States visa regulations, foreign students can only come over if they can demonstrate ability to support themselves while here (without working at jobs in the general national economy). They can demonstrate that by evidence that </p>
<p>a) they are rich, </p>
<p>or </p>
<p>b) they have full support from the receiving institution. </p>
<p>It’s up to each college/graduate school to decide what scholarships or fellowships to offer what categories of students. No college will go out of its way to get worse students at the same price at which better students are available. Only a few colleges have sufficient resources to offer to fully support all undergraduate students with financial need, so the majority of foreign students from some poor countries will continue to arrive as graduate students.</p>