10 most difficult United States riddles

The Battle of Cooch's Bridge was the only American Revolution battle held in Delaware. It is also the first ever battle where the U.S. stars and stripes has been flown. Unfortunately for the Americans, this was a defeat. This led to the fall of Philadelphia, which was then the nation's capital.

Mount Whitney is the tallest mountain in California, as well as the highest summit in the contiguous United States and the Sierra Nevada—with an elevation of 14,505 feet

There were the Olympic Games in St. Louis (1904), twice in Los Angeles (1932, 1984) and in Atlanta (1996)

The machine was invented in the United States by the Rudd-Melikian company in 1947, debuting as the "Kwik Kafe". Several U.S. companies also began manufacturing the machines in 1947, and by 1955 over 60,000 existed in the U.S. Today, coffee vending machines exist in various areas of the world, and are very common in Japan.

Washington Union Station is a major train station, transportation hub, and leisure destination in Washington, D.C. Opened in 1907, it is Amtrak's headquarters and the railroad's second-busiest station with annual ridership of just under 5 million and the ninth-busiest in overall passengers served in the United States. Daniel Burnham, a famed Chicago architect wrote; "The station and its surroundings should be treated in a monumental manner, as they will become the vestibule of the city of Washington, and as they will be in close proximity to the Capitol itself."

Yale University is found in New Haven, Connecticut. The university has produced 5 U.S. presidents, and many other notable alumni.

Martin Van Buren was the eighth president of the United States. 'Van' suggests Dutch origin of his surname, but the capitalized form indicates anglicised version - like Eddie Van Halen (as opposite to Dutch lower-case Vincent van Gogh).

Located in Montezuma County, Colorado, the park protects some of the best-preserved Ancestral Puebloan archaeological sites in the United States. It's one of the three UNESCO World Heritage Sites located in the U.S. that are credited to the Anasazi, alongsidde with Chaco Culture National Historical Park and Taos Pueblo.

Lewes was the first settlement in Delaware, being founded as a Dutch whaling and trading post in 1631. With Delaware being the first U.S. state to ratify the Constitution, Lewes is the first town in the first state.

White Sands, having 442 total square kilometers of dune fields, is the world's largest surface deposit of gypsum. Unlike other desert sands, it is cool to the touch, due to the high rate of evaporation of surface moisture and the fact that the sands reflect, rather than absorb, the sun's rays.