Columbus'sColumbus' original goal in his voyage was to reach Asia, to visit Japan and have some of it isits riches (spices, gold ...)
I guess ColombusColumbus thought the world map looked like this. (America doesn't exist) ![map arround year of 1300][1] [1]: https://i.sstatic.net/nKfVd.jpg)
He thought if he traveled towards the west, he would reach Asia .He He didn't know that the world map was different and that America exists in between.