Here's the title again, because it is my question: Where, when and who could've invented String Instruments in Precolumbian America?
IOTL, no one in precolumbian america invented stringed instruments. They had many other kinds, but because there was no Oud or Harp analogue, stringed instruments supposedly did not appear, soooooo....
Given a culture had enough precontact time and the proper circumstances, who could've invented some kind of stringed instrument in Precolumbian America?