Answer:
a. The United States became the leading manufacturer in the world in terms of total production and output per worker.
Step-by-step explanation:
This era is characterized by prosperity and expansion. The country became a rich, fully-indutrialized nation. American businesses took advantage of new sources of energy and new forms of labor organization, there were huge leaps in productivity. Soon the domestic markets were not enough. Expansion toward Latin American and other markets ensued.