Question

How many courts does the Constitution create? where do the other federal courts come from?

Answer 1

How many courts did the USConstitution establish?

Only one. Under Article III, Section 1 the framers created the SupremeCourt, yet they
established no other judicial bodies.

Where do the other federal courts come from?

The judicial Power of the United States, is vested in one supreme Court, and in such inferior Courts (Federal courts) as the Congress may from time to time see fit and establish.