One of the strengths of the United States is its diverse economy, which comprises many industries that contribute to overall economic development and greater stability. Total U.S. economic output topped $16 trillion in 2015, and each state’s contribution to overall GDP was unique, both in terms of size and industrial composition.

For example, California, New York, and Texas each generated over $1 trillion in economic output in 2015. Combined, these three states accounted for 31% of the nation’s total economic output. Each state’s unique economic landscape is shaped by a range of factors, from legal regulations to the presence natural resources. For example, with the nation’s largest oil reserves, oil and gas extraction drives Texas’s economy. Meanwhile, since removing certain banking restrictions, credit intermediation drives the South Dakota economy

3. Arizona
> Largest industry: Ambulatory health care services
> Industry GDP contribution: $12.5 billion
> Industry output as pct. of GDP: 4.8%
> Industry workforce: 291,764

Accounting for $12.5 billion in economic activity, ambulatory health care, which includes services provided by clinics and doctors offices, is the largest industry in Arizona. Economic output generated by outpatient health care services expanded by 5.4% from 2014 to 2015. The elderly typically require more frequent medical care than younger people, and some 16.4% of Arizona residents are 65 or older — one of the larger shares of all states.

Real estate is by far the largest industry in the United States and the largest contributor to GDP in most states. But since housing is a universal need irrespective of geography, it fails to illuminate regional economic differences. In order to capture the unique economic features of each state, 24/7 Wall St. reviewed the largest industry in each state by GDP contribution — excluding real estate.

Click here to see the largest industry in each state.
Click here to see our detailed findings and methodology.