Americans are all too familiar with the federal government’s intrusion into our daily lives. It sometimes seems that the feds have their hands in nearly every aspect of our daily life: what we drive, how we educate our children, down to the very food we eat. Unfortunately, Americans are less familiar with how the federal government is able to justify such intrusions.
They should look no further than the Commerce Clause of the U.S. Constitution, which is embodied in Article I, Section 8, Clause 3:
To regulate Commerce with foreign Nations, and among the several States, and with the Indian Tribes
The Founders included this provision in the enumerated powers of the federal government to prevent discriminatory commercial activities between the states and to secure regulation of international commerce for the federal government only. That seems reasonable enough.