Because of (9letters) people began to share common information and influences creating a national culture. (during 1920s)

During the Golden Age in 1920s Jazz Music, Art, and Cinema. Jazz Music influenced the American Culture.

Explanation:

During 1920s many things became a part of popular culture including Automobiles, Flappers, Nightclubs, movies and Jazz. After world war 1 people had a sense of prosperity and freedom and the life began to move fast.

New industries were setting up new products emerged in the markets. This is why it was known as the Golden Age where people started getting aware of their surroundings and were influenced by the music, movies and art and hence creating a national culture.

answer; regard the action of other people negatively;

answer; a team- maintenance role;