Can you guess these surprising facts in American history?
by Maria Trimarchi

Did you know no U.S. president wore long pants (instead of knee breeches) until James Madison took office? Or in what war Mexico lost roughly one-third of its territory (present-day Arizona, California, Nevada, New Mexico, and Utah) to the U.S.? (That's the Mexican-American War.) See how much you know about White House pets, presidential gambling habits and American DNA.

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