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Alaska and Hawaii are the only two states in the United States that do not share a border with another state.

Maine is the only state in the United States that has a border with only one state.

Mount McKinley, in Alaska, is the tallest mountain in the United States. It is 20,320 feet tall.

In population, the largest city on the Missouri River is Kansas City, Missouri.

The U.S. state having the most towns with the word "liberty" in their name is Iowa, with 4: New Liberty, West Liberty, Libertyville and North Liberty.

The shortest coast to coast distance across the continental United States is between Brunswick, Georgia and San Diego, California at 2,089 miles.

In area, the smallest U.S. state west of the Mississippi River is Hawaii at 10,932 square miles.

Five states became states during the 20th century: Alaska, Arizona, Hawaii, New Mexico and Oklahoma.

The largest dam in the United States is the Grand Coulee Dam in the state of Washington.

The state with the most counties is Texas, with 254.

Chocolate and vanilla were first discovered in Mexico.

Arroyo Seco Parkway was the first freeway in California. It opened on December 30, 1940 and connected Los Angeles and Pasadena.

Four states have the name of a U.S. president in the name of their state capital. The states are: Mississippi, Missouri, Nebraska and Wisconsin. The capitals are: Jackson, Mississippi; Jefferson City, Missouri; Lincoln, Nebraska and Madison, Wisconsin.