Approximately 4 to 5% of the U.S. population has one or more clinically significant phobias in a given year. Specific phobias occur in people of all ages. The average age of onset for social phobia is between 15 and 20 years of age, although it can often begin in childhood.
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Saint Augustine, Florida, is the oldest European settlement in North America.
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The United States does not have an official language.
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Although African-Americans make up only 13% of the U.S. population, they accounted for one half of the estimated new HIV/AIDS diagnoses in 2004.
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50% of pizzas in America are pepperoni.
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Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
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The first semi-permanent settlements appeared in Florida around 5000 B.C.
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The average American spends a third of their overall time online playing games and using social networks.
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