Final answer:
Industrial growth in the United States during the 1920s exceeded expectations despite the absence of laissez-faire policies and minimal business regulation.
Step-by-step explanation:
The surprising aspect of industrial growth and expansion in the United States during the 1920s was that it exceeded expectations.
Despite the absence of laissez-faire policies and minimal business regulation, the economy experienced a period of significant growth and prosperity. Mass production, especially in industries such as automobiles, increased mobility and fostered new industries. Unemployment rates dropped as businesses expanded to meet the rising demand.
However, it is important to note that economic problems began to emerge towards the end of the decade, leading to a subsequent economic crash and the end of the period of innovation and prosperity.