[tacticalogic]

The scope of federal power exercised over commerce expanded as the nature of commerce generally and progressively became less local in nature.

Are the limits of the scope of federal power over commerce set by the Constitution, or the courts?

[Mojave]

Are the limits of the scope of federal power over commerce set by the Constitution, or the courts?

False dichotomy.

The Constitution, the Congress, the courts and the changing nature of commerce all play rolls in determining the extent to which federal powers are exercised in that arena.