Research by American Heritage found that the Royal Navy lost 24 warships sunk or heavily damaged in October 1780, which must have affected Britain's ability to fight in the months before the surrender at Yorktown.
In September 1862, the South hoped to end the war by invading Maryland just before the mid-term elections. But its hopes were dashed after the bloodiest day in American history.
By artfully illustrating the boundaries of colonial powers, mapmakers in the 1700s helped define what our New World would become.
In 1928, an attempt to land the first men on the North Pole ended in tragedy when the airship Italia crashed, sparking the largest polar-rescue mission in history.