Why is it unconstitutional for a state government to ban products imported from a foreign country?

It is unconstitutional for a state government to ban products imported from a foreign country because such actions violate the Commerce Clause of the U.S. Constitution, which grants Congress the power to regulate interstate and international commerce. The Constitution ensures that states cannot enact laws that interfere with the free flow of goods across state and national borders, as this could lead to economic fragmentation and conflict among states. Additionally, state bans on foreign imports may conflict with federal trade agreements and policies established by the federal government.