Earlier quoted context omitted.
Do Kia (reborn in 1986), Tata, and Saleen not count as successful? Tesla has had an impressive rise, but it's not like nothing happened between 1923 and 2003 in the automotive industry.
Good point, but I'm sure the point was no new american automobile companies succeeded until tesla
EV cars have existed for more than a century and been tried out by many companies. They all failed to mark a significant dent in the market because batteries technologies weren't as advanced as now, and because regulations weren't as strict as they are now.
Tesla was founded right when at a crossing point when California and European Union emissions regulations started to be more and more stringent and efficient batteries affordable enough. Being an EV-only company it was granted a very generous loan from the US government. This is a kick start no small automotive company ever got.
Not saying Musk hasn't any part in how the development, manufacturing and sale process was done. He certainly is one of the first to make people accept and even pay to be beta testers of an unfinished product/vehicle.