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Why did Martin’s Act fail to grant animals legal rights?

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Three PETA protesters in animal masks and green clothing hold signs reading No Fur at a demonstration against fur in clothing at a shopping district in Seoul, South Korea. — Animal rights A PETA (People for the Ethical Treatment of Animals) demonstration in Seoul, South Korea, against the use of animals for fur in clothing.

Martin’s Act (1822) failed to grant animals legal rights because it did not alter their fundamental status as "legal things" rather than "legal persons" under the law.1

Historically, Western legal systems have been built upon the Roman principle that all law was established for the sake of humans. Consequently, animals have been categorized as objects over which humans exercise property rights, rather than as beings possessing their own inherent rights.1

While Martin’s Act was a significant humanitarian effort that criminalized the cruel treatment of specific domesticated animals, its scope was limited. It did not protect the general welfare of animals, and it functioned primarily as an anticruelty statute rather than a recognition of animal personhood. Because the law continued to view animals as property—objects of rights rather than subjects of rights—it could not provide them with the legal standing necessary to possess rights of their own. This traditional legal framework has persisted in many jurisdictions, where animal-protection statutes serve to regulate human conduct rather than grant animals independent legal status.1