<prompt> Bhala okuqhubekayo kwalesi sigaba - I-ukulele ye-harp yavela ngawo-1910, lapho isiginci se-harp sasithola ukuthandwa okuthile, futhi i-ukulele yayisanda kuqala ukuthandwa ezweni lonke e-United States ngenxa yokusetshenziswa kwayo ePanama Pacific International Exposition  <response>: ka-1915. 