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 Canadian province of New Brunswick (which was part of the UK at the time) had a bloodless war with the US state of Maine in 1839
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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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The average American spends a third of their overall time online playing games and using social networks.
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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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According to some estimates, Americans are sitting on $30 billion worth of unredeemed gift cards.
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Saint Augustine, Florida, is the oldest European settlement in North America.
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The first semi-permanent settlements appeared in Florida around 5000 B.C.
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