This is a period during the 1920s when the national attitude was positive and upbeat, and americans had money as the stock market soared. traditional values saw a decline, and modernism was the cultural focus

The "Roaring 20s"/"Jazz Era was the period in the 1920s when the world was largely recovered from World War I and was freely spending.

The Roaring 20s are large associated with jazz, flapper culture, and changes in art. Famous figures include F. Scott Fitzgerald, Gertrude Stein, Pablo Picasso, and others. The US in this time period became the world's dominant financial force as a result of the Dawes Plan, which worked to create financial instruments to handle Germany's reparations from World War I.

the correct answer is:   the domino theory states that if one country in a region came under the influence of communism, then the surrounding countries would follow in a domino effect.