The invention of Alternating Current (AC) and the tri-phase motor (?) would be markedly delayed. Electric power could not be transmitted over long distances so it would be limited to cities. Motors would be less efficient for some time. Tesla’s inventions lead to major labor saving devices, if they are delayed then labor efficiency is reduced. Also, Westinghouse Electric Company may not be a success.
If Nikola Tesla was never born then the death of his brother, Dane, might be butterflied away. Dane was considered to be smarter than Nikola.