Answer:
A major indicator that the US economy was not as strong as many believed it to be in the 1920s was
a. The growing strength of labor unions and industrial militancy.
b. In the 1920s, more people lived on farms than in cities.
c. The declining US birthrate.
d. The growth of credit and advertising - aimed to stimulate and finance consumption - even though the average consumer was unable to pay for new products.