There was a huge war in Italy at the time and Machiavelli wanted to give rulers advice on how to rule their countries more efficiently. His trademark phrase in The Prince was that "the ends justifies the means". Meaning, as long as the result is good for country, what you did to achieve that result doesn't matter.
lincoln
he was not the only high ranking government official that John wilkes slated for assaination
He made geographical miscalculations.
Coumbus though that the world was small, and Asia was enormous.
His calculation was that Asia was 3,000 miles from Portugal
They are most common in southern states