I'm a patient guy. Let's try again.
In the case, "Bibb v. Navajo Freight Lines Inc.", the SCOTUS had to decide a case with those facts:
I just copy pasted those from a website that deals with legal cases.
So what do you think the Supreme Court did? And, what would you have done?
Well since we're now talking about an actual case rather than a hypothetical situation where the facts can change to suit an argument, we can have a discussion.
Without knowing any of the facts outside of what this website provides:
Bibb v. Navajo Freight Lines Inc., U.S. Supreme Court Case Summary & Oral Argument
I can say that I actually agree with the Supreme Court's decision. For one, I don't think the state should be mandating what type of mudflap a truck can use, but that's not the main reason I agree with the court. If Illinois mandates one type of mudflap be used, but Indiana mandates a different kind, then that obviously creates a strain on those trucks that travel between Illinois and Indiana. The problem only gets compounded if you look at the fact that Kentucky could then mandate a third type of mudflap, and on and on it goes. If every state can set its own requirements like that then you do have a concern for interstate commerce being interrupted. Since regulating interstate commerce means "to make regular" I see this as a legitimate constitutional decision by the Supreme Court.
You agree with the inner logic of the decision. I agree with your reasoning. But what is your constitutional reasoning?
How can federal law (or the federal constitution) interfere with something that, you have to agree, looks like a local matter to begin with? Is it clear to you that this falls under the federal government having the power to regulate interstate commerce?
Because for me, I think the argument could be (and was made) either way.
Same for health care. If you think of healthcare as something affecting our ability to compete internationally (for example, prevening GM from being competitive worldwide), then I could see how the federal government would need to get involved in the matter.
Anyways, I know I am getting side tracked, but I just wanted to show you a case where "nowhere in the constitution does it say that the federal government can regulate what mudflaps states want to mandate", yet we don't see this ruling as the federal government usurping the power of the states.