Are all fields that require a scientific background supported?

No. Only the majors that are considered NSF STEM Majors are supported. The following link will help you determine which fields are supported.

Must I be a United States citizen?

Students should be citizens or permanent residents of the United States of America.

I am interested in applying for graduate school. How can the TAMUS LSAMP program help me?

The Bridge to the Doctorate (BTD) Program is one of the programs offered by TAMUS LSAMP that is geared towards graduate students. You can find out more information on the BTD program here.

Who is Louis Stokes?

Louis Stokes is currently a member of the U.S. House of Representatives. In 1968, Louis Stokes was recognized as the most prominent civil rights lawyer in Cleveland. He also served as the main political advisor to his brother, Carl Stokes, who was the first African-American mayor of a major U.S. city (Cleveland, OH). As a cofounder of the Congressional Black Caucus, he perceives his role as champion of the underclass.
— More information on Louis Stokes can be found here