Puerto Rico enacted a law that required specific labels on cement sold in Puerto Rico and imposed fines for any violations of these requirements.

The law prohibited the sale or distribution of cement manufactured outside Puerto Rico that does not carry a required label warning and barred that cement from being used in government-financed construction projects.

Antilles Cement Corp., a Puerto Rican firm that imports foreign cement, filed a complaint in federal court. Antilles claimed that this law violated the dormant commerce clause. (The dormant commerce clause doctrine applies not only to commerce among the states and U.S. territories, but also to international commerce.) Write three paragraphs discussing whether the Puerto Rican law violates the dormant commerce clause. Explain your reasons.