States are part of countries, and countries may be grouped by other areas, like continents, hemispheres, or a political or economic body. The US is also commonly referred to in three distinct ways: as ...

We study the causes of “nutritional inequality”: why the wealthy eat more healthfully than the poor in the United States. Exploiting supermarket entry, household moves to healthier neighborhoods, and ...

The United States is a collection of oddly shaped territories whose silhouettes have become instantly recognizable. How did Michigan lay claim to the Upper Peninsula and not Wisconsin? Here are ...