Article III of the Constitution gives Congress the power to create a system of federal courts, other than the Supreme Court, known as superior courts.
inferior courts.
original courts.
appellate courts.

inferior courts

Explanation:

"The judicial Power of the United States, shall be vested in one supreme Court, and in such inferior Courts as the Congress may from time to time ordain and establish. The Judges, both of the supreme and inferior Courts, shall hold their Offices during good Behaviour, and shall, at stated Times, receive for their Services, a Compensation, which shall not be diminished during their Continuance in Office."

what are the reasons

the border between arizona and new mexico is a thin, black line; this indicates a state boundary.

its correct: it's a thin line, and it's a state boundary, correct