Answer:
Civil Liberties
Step-by-step explanation:
In U.S. vs Lopez, the main issue would have to concern civil liberties. Lopez was not arrested for carrying a firearm because of his race or ethnicity, so this could not be identified under civil rights. Rather, Lopez was arrested because of his action to bring a gun to school and how it relates with the 2nd amendment and commerce clause. This means it would be identified as a an issue of civil liberties.