Settled the dispute in the 1877 dispute of the presidential election and ended the Reconstruction Era.
He gave the Emancipation Proclamation after the Battle of Antietam.
In October 1962, an American U-2 spy plane secretly photographed nuclear missile sites being built by the Soviet Union on the island of Cuba. President Kennedy did not want the Soviet Union and Cuba to know that he had discovered the missiles. He met in secret with his advisors for several days to discuss the problem.
They both were located in peninsula (an island surrounded by water on all sides). It was a great location because it provided water to survive, the attacks were limited since barbarians had to take ships in order to get there, great trade since they had ship routes all over the rivers/oceans.