1) The 1963 Birmingham march, organized by SCLC, challenged the extreme segregation policies in the city and resulted in violent clashes between protesters and police. Images of police attacking children with dogs and fire hoses shocked the nation and the world.
2) Martin Luther King Jr. was arrested during the march and wrote his famous "Letter from Birmingham Jail" defending nonviolent protest. Over 2000 protesters were also arrested.
3) The violence in Birmingham persuaded President Kennedy to support civil rights legislation and helped lead to the landmark Civil Rights Act of 1964, showing how the marches raised awareness and advanced the civil rights movement across the country.