Arizona passed a law requiring trains passing through the state to be shortened for safety purposes. The Supreme Court struck down the state rule as unconstitutional.

Question

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The Supreme Court struck down the Arizona law on the grounds that it interfered with interstate commerce, which is regulated by the federal government, not individual states. This decision is based on the principle that states cannot pass legislation that significantly interferes with interstate commerce, as it is under the purview of the federal government according to the Commerce Clause of the U.S. Constitution.

Arizona Passed a Law Requiring Trains Passing Through the State