Southern Pacific Co.v.Arizona concerned whether Arizona could,for safety considerations,
Require trains traveling through the state be a shorter length than trains traveling through other states.The Supreme Court justified striking down the Arizona law because:

Question

Quizplus · Accepted Answer

The best choice is D because the Supreme Court justified striking down the Arizona law based on the fact that it interfered with interstate commerce. The Court held that the law conflicted with federal standards, which only Congress could regulate, and that Arizona's interest in safety was not sufficient to justify the burden on interstate commerce imposed by the law.