MR. JUSTICE BLACKMUN delivered the opinion of the Court.
The issue in this case is whether, consistent with the Commerce Clause, U. S. Const., Art. I, § 8, cl. 3, the State of South Dakota, in a time of shortage, may confine the sale of the cement it produces solely to its residents.
I
In 1919, South Dakota undertook plans to build a cement plant. The project, a product of the State's then prevailing Progressive political movement, was initiated...
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