Why was it necessary to pass an act in 1964 that was almost identical to the civil rights act that was passed in 1875?

The Civil Rights Act of 1964 was necessary because the Civil Rights Act of 1875 had been largely rendered ineffective by the Supreme Court's rulings in the late 19th century, which allowed for widespread discrimination and segregation, particularly in the South. The 1964 Act sought to strengthen and enforce civil rights protections against racial, gender, and other forms of discrimination, reflecting the growing Civil Rights Movement and societal demand for equality. Additionally, it addressed systemic injustices and provided mechanisms for federal enforcement, which were lacking in the earlier legislation.