As explained in "United States v. Lopez", , "For nearly a century thereafter (that is, after "Gibbons"), the Court's Commerce Clause decisions dealt but rarely with the extent of Congress' power, and almost entirely with the Commerce Clause as a limit on state legislation that discriminated against interstate commerce. Under this line of precedent, the Court held that certain categories of activity such as "exhibitions", "production", "manufacturing", and "mining" were within the province of state governments, and thus were beyond the power of Congress under the Commerce Clause. When Congress began to engage in economic regulation on a national scale, the Court's dormant Commerce Clause decisions influenced its approach to Congressional regulation.