The main purpose of this legislation is to establish the Justice Thurgood Marshall National Historic Site in Maryland as part of the National Park System. This site will honor the significant contributions of Thurgood Marshall, who was a key figure in the civil rights movement and the first African American Supreme Court Justice. The goal is to preserve and interpret his legacy for future generations. Key provisions of the legislation include the establishment of the historic site at Public School 103 in Baltimore, where Marshall attended elementary school.