Can you imagine each state having varying rules and regulations regarding commerce coming in from other states? What are some other similar provisions?
Since the question does not mention any specific provisions, it is not possible to know what “similar provisions” would be. I will try to answer this by discussing possible provisions that states could institute that would make it harder for commerce to take place between states.
One thing that states might do would be to require all drivers to have licenses from each state that they drive through. As it is, a driver’s license from one state is good in every other state. If states required all drivers (or even just truck drivers) to have a license from each state, it would cause a great deal of trouble.
Another thing that would cause problems would be if each state required all goods coming in from other states to be inspected when they entered the state. This would mean that every time Wal-Mart, for example, got a shipment of merchandise at any store, government officials would have to be there to inspect it and make sure that it met all state standards. This would add tremendous amounts of time to the process of getting shipments into stores.
It is because of things like this that the Commerce Clause leaves it to the federal government to regulate interstate commerce.