What were the conditions that led to the civil rights movement?

In 1954, the civil rights movement gained momentum when the United States Supreme Court made segregation illegal in public schools in the case of Brown v. Board of Education. In 1957, Central High School in Little Rock, Arkansas asked for volunteers from all-Black high schools to attend the formerly segregated school.

Explanation:

Segregation is just a fancy word for separation of colored and white people. So much happened to the African american community that should have been the alarm set for them to start a civil movement but to older people the younger or future generations are far more important, this is why the civil rights movement gained momentum and begin to flourish after it became illegal for segregation to be implemented in school, that's why people fought to enforce or ensure that it stayed that way.

i would go with the last one