Question

1. how many years passed between the desegregation of schools and 9 african american students were blocked from entering all white central high?

Explanation:

1. The U.S. Supreme Court's Brown v. Board of Education decision (1954) ordered the desegregation of public schools, marking the start of school desegregation.
2. The event where 9 African American students (the Little Rock Nine) were blocked from entering all-white Central High School in Little Rock, Arkansas occurred in 1957.
3. Calculate the difference between the two years: $1957 - 1954 = 3$.

Answer:

3 years