States are part of countries, and countries may be grouped by other areas, like continents, hemispheres, or a political or ...

The largest country in North America by land area is Canada, although the United States of America (USA) has the largest population. It is very cold in the north, near the Arctic Circle and it is ...

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 ...