In Reynolds v. Sims (1964), the U.S. Supreme Court implemented the principle of "one man, one vote", ruling that congressional districts had to be reapportioned based on censuses (as the state already included in its constitution but had not implemented.)
ɪn ɹˈɛnəldz vˈiː. sˈɪmz nˈaɪntiːnhˈʌndɹɪd sˈɪksti fˈoːɹ, ðə jˈuː.ˈɛs. suːpɹˈiːm kˈoːɹt ˈɪmplɪməntᵻd ðə pɹˈɪnsɪpəl ʌv "wˈʌn mˈæn, wˈʌn vˈoʊt", ɹˈuːlɪŋ ðæt kəŋɡɹˈɛʃənəl dˈɪstɹɪkts hædtə biː ɹˌiːɐpˈoːɹʃənd bˈeɪst ˌɔn sˈɛnsuːsᵻz æz ðə stˈeɪt ɔːlɹˌɛdi ɪŋklˈuːdᵻd ɪn ɪts kˌɑːnstɪtˈuːʃən bˌʌt hæd nˌɑːt ˈɪmplɪməntᵻd.