One of the mysteries of the English language finally explained.
The doctrine that white people are superior to other peoples, and should therefore have greater power, authority, or status; advocacy or practice of such a doctrine.
1940s; earliest use found in The Chicago Defender. From white + supremacism, after white supremacist.
white supremacism/ˌwʌɪt sjʊˈprɛməsɪz(ə)m//ˌwʌɪt sʊˈprɛməsɪz(ə)m//ˌwʌɪt suːˈprɛməsɪz(ə)m/
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