Which technological development had the MOST impact on changing American attitudes towards civil rights?

The advent of television in the 1950s and 1960s had the most significant impact on changing American attitudes towards civil rights. It brought graphic images of the struggles and injustices faced by African Americans into living rooms across the country, fostering empathy and awareness among viewers. Events like the Selma marches and coverage of police brutality highlighted the urgent need for change, galvanizing public support for civil rights legislation. This visual documentation played a crucial role in shifting perceptions and mobilizing activism.