““As with Britain, growth in the United States started with agriculture. Then, steel, railroads, automobiles, electricity, consumer appliances, telecommunications and chemicals were among the new industries that pulled America forwards. Later in the 20th century, entertainment, electronics and new service industries continued the growth. Immigration and financial expansion helped sustain the growth. At the same time there has been continuing improvements in production efficiencies. The result has been a succession of changes – new industries and increasing productivity – which have driven ongoing growth in spending, production and incomes.””
