The invention of new machines increased worker productivity leading to rising wages. The growing independence of American women following the 19th Amendment to the constitution, which gave women the right to vote and the fact that most women continued to work after the war. Many companies grew larger during the 1920s, creating many new jobs.
The answer is: The United States had not incurred high levels of foreign debt during World War I.
All of the expense that occurs during the war must be paid to the losing country (i.E germany) and this usually caused a huge debt for the country. Since united states was on the winning side, it can still continue its economic growth at a healthy rate. this contribute to the economic prosperity during the roaring 20s.
