Technology

In 1850, all the prime movers in the United States (human bodies, work animals, steam engines in factories, sailing ships, etc.) had a capacity of less than 10 million horsepower;

Today, it is more than 35 billion-- 3500 fold increase in only a little more than a century, and a 350 fold increase in per capita terms.

In 1850, all the prime movers in the United States (human bodies, work animals, steam engines in factories, sailing ships, etc.) had a capacity of less than 10 million horsepower;