They join the rest of the USA. Right now Worldometer has the US case rate at 9.65% of the population. Actual cases would be some proportion higher than that. That means, at absolute minimum, one-tenth of the US population at least is currently suffering or has had covid.
I hope the year of misery and heartache that has accompanied attaining that mark may finally close down any remaining suggestion that naturally acquired herd immunity, which would be something like 7x that level, is in any way a suitable strategy for getting through this pandemic.