It was the Battle of Waterloo, at Waterloo (In Belgium) in which Napolean was against the Duke of Wellington for the first part (We were outnumbered during this part), and then the Prussian army came to back up Wellington, meaning we outnumbered them, and won
This stance repulsed the New York State Democrats and encouraged them to join with anti-slavery Conscience Whigs and the majority of the Liberty Party to form the Free Soil Party, which was formalized in the summer of 1848 at conventions in Utica and Buffalo.
George H.W. Bush was the president at the time.
I believe it was a long drought :P