How is a bass guitar made?

this is a debatable question. because firstly, the Bass Guitar is just utilizing the E A D and G strings of a regular guitar except for the fact that they are tuned an octave lower so the question isn't really who invented the "bass" but really who pioneered the idea. in a different universe entirely theres the upright bass which is not only fretless but like its name states it stands upright and the upright bass has been used for many years. research it in musical history books and decide for yourself. hope this helps - Kyse