Which constitutional clause empowers the federal government to regulate commercial activities among the states?

Read Classic Case: 2.1 Heart of Atlanta Motel v. United States, pp. 28-29. Conduct further research, and address the following questions:
Does the Civil Rights Act of 1964 actually regulate commerce or was it designed to end the practice of race (and other forms of) discrimination?
Are there any businesses in today’s economy that are “purely local in character”?
Which constitutional clause empowers the federal government to regulate commercial activities among the states?

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