Why did Amerigo Vespucci go on his voyage?

Answer 1

His exploratory journeys along the eastern coastline of South America convinced him that a new continent had been discovered, a bold contention in his day when everyone (except the Portuguese), including Christopher Columbus, thought the seafaring trailblazers setting out from European docks were travelling to East Asia and South Asia.



http://en.wikipedia.org/wiki/Amerigo_Vespucci

Answer 2

actually he went on his vayage to map out the new world.
He would gain credit and name America after himself