Final answer:
The term 'race records' was replaced by 'Rhythm and Blues' in 1949. Rock and roll, which evolved from this genre, helped blur racial lines by integrating black and white audiences and promoting racial harmony through music.
Step-by-step explanation:
In 1949, the industry trade journal Billboard replaced the term 'race records' with the term 'Rhythm and Blues' (R&B). This genre emerged in the 1940s, combining aspects of blues, jazz, and country music, and became a primary influence on the development of rock and roll.
The birth of rock and roll played a significant role in blurring racial lines and advancing the end of certain types of segregation across the United States.
Culturally and socially, rock and roll encouraged the integration of black and white teenagers, particularly through its influence on social interactions and increased intermingling.
This integration was further boosted by the fact that record companies, driven by economic demand, signed both black and white artists, and sold their records in the same stores, thus promoting racial harmony through music.