Rock and Roll came out about the time of the Television gaining popularity in the U.S. Television was absorbing the dramas that had previously been on radio. As such, radio was expanding into the music market. One of the pioneer radio hosts was "Moondog" Alan Freed in Cleveland, Ohio is credited with naming this new style of music which was in part derived from R&B music.
I'm not sure but extract is a synonym of abstract
They were made the year of 1939 :) Hope this helped!!
The event that had hppen as i can remeber was the tea party
George Washington was the first president of USA. He was also a military gernal. who fought to get independence from England.