When Congress enacts a federal minimum wage or passes a law prohibiting racial discrimination in privately owned stores and restaurants, such actions are supported by a particular clause of the Constitution, with an interpretation of that clause that the Supreme Court has only allowed since the 1930s. What is that clause, and what is the specific way of interpreting it that gives Congress this power?

When Congress enacts a federal minimum wage or passes a law prohibiting racial discrimination in privately owned stores and restaurants, such actions are supported by a particular clause of the Constitution, with an interpretation of that clause that the Supreme Court has only allowed since the 1930s. What is that clause, and what is the specific way of interpreting it that gives Congress this power?