Seattle recently became the first U.S. city to add “caste” to its list of categories protected from discrimination. The law defines “caste” as “a system of rigid social stratification characterized by hereditary status, endogamy, and social barriers sanctioned by custom, law, or religion.”Led by Seattle Councilwoman Kshama Sawant (who was raised in Mumbai within an upper-caste Hindu Brahmin household), the law bans caste discrimination in workplaces, housing and places of public …