Jesus Christ established monogamy, the marriage of one man to one woman, as the canonical norm of his church and the juridical norm for all nations. This was a unique event in the history of the cultures and religions of the world. The Catholic Church has always defended its canonical norm of monogamy, often with great opposition. Through its influence, monogamy has been established as law in the Western world and in almost all cultures influenced by Western law and norms. The emerging jurisprudence of the United States, however, rejects any religious derivation as the basis of our laws. With that rejection, how can our laws affirming monogamy—-our laws against polygamy—-survive on a principled basis?
Bromberg, Howard J. "Mulieris Dignitatem and the Exclusivity of Marriage Under Law." Ave Maria L. Rev. 8, no. 2 (2010): 431-42.