For comparison, that number is 53% in China and 60-70% in most European countries. In Norway 97% of new sales are EVs.
Because a lot of Americans lacks financial literacy (i.e. everyone buying a brand new ICE vehicle).
Even before that godforsaken war it made no financial sense at all to buy an ICE vehicle for most purposes. Now with that war and its effects wrecking the fossil fuel markets, it's even worse.
If you could not charge at home then a high mileage ICE vehicle (before the war) had lower energy costs in a significant fraction of the US.
Even with home charging there were something like 10 states where a Prius beat an EV if you were paying the state average rates for gas and for home electricity.
Massachusetts was the state most favorable to ICEs. In the Boston area a Prius would have lower energy costs in the city as long as gas was under about $4.40/gal.