During the 1920s, the united state economy moved through which phase of the business cycle?
a. expansion
b. peak
c. contraction
d. trough

During the 1920s, the United States economy experienced enormous growth and became the wealthiest and most productive economy in the entire world. Therefore, during this time the economy went through a period of expansion. However, in 1929 a major depression plagued the American economy which led to massive decline, therefore this period would largely be defined as an expansionary period which was a peak in the economic cycle prior to the Great Depression. 

The answer is because it’s b 100% sure