What did the music industry call recordings from the 1920's until the late 1940's that were made by African Americans artists and produced mainly for sale to African American listeners, or made by "Hillbilly" artists and distributed mainly for sale to rural southern listeners?

They were called Race Records

Explanation:

Race Records were recordings of music made by African Americans, and directed primarily to African Americans. The genres were: blues, jazz, and gospel.

With time, White Americans began to listen to race records as well, influencing the music that they themselves produced. For example, many white people began to play jazz and blues.

determination

in 1862, president lincoln's emancipation proclamation opened the door for african americans to enlist in the union army. although many had wanted to join the war effort earlier, they were prohibited from enlisting by a federal law dating back to 1792.

explanation: