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 has paved enough roads to circle the Earth over 150 times.
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There are six times as many people of Irish descent living in America than in Ireland.
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One million Americans, about 3,000 each day, take up smoking each year. Most of them are children.
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The first semi-permanent settlements appeared in Florida around 5000 B.C.
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The United States does not have an official language.
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