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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One million Americans, about 3,000 each day, take up smoking each year. Most of them are children.
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There are six times as many people of Irish descent living in America than in Ireland.
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Saint Augustine, Florida, is the oldest European settlement in North America.
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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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Americans throw out 4.5 pounds of trash a day - twice that of 40 years ago.
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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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The first semi-permanent settlements appeared in Florida around 5000 B.C.
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