Foxconn in one factory have up to 350,000 workers
Like to see if Apple production is in the USA we can get 5,000 people show up for work, work 10+ hrs. 6 days a week.
This is the problem. China can/has concentrated positively enormous amounts of factories and workers in some cities like Shenzhen, with hundreds of thousands of workers willing and able to work there. No city in the USA could currently offer this capacity to Apple. It's not just a matter of building an Apple factory, it's a matter of making an entire purpose built city around it - if what you want is a US Apple factory complex like the ones in China.
I don't think most people really comprehend how vast the production capability is - a quick google search suggests Apple made around 233 million iPhones in 2021. If you keep the factory running 7 days a week, that's well over
half a million phones every day (638k phones a day, actually, so closer to 2/3 million a day). And that's
every single day. You've got to get the parts delivered for today's half million phones (well, likely those are in nearby county-sized warehouses and what's delivered today are parts for next week's phones), and you've got to make today's half million phones, and you've got to get a half million phones shipped out to make room for tomorrow's phones.
I would love to see Apple build factories in the US. I don't see it happening very soon, because if you built them like the current factories, they'd need hundreds of thousands of skilled workers, living in close proximity to the factory, all working for Apple - a "company town", the likes of which haven't been seen in this country in a very long time. The infrastructure for this isn't there and would have to be built up. What I expect to see, eventually, is
highly automated Apple factories in the US, with
much less hand assembly work being done. I'd also expect it would make sense for Apple to position factories around the world - keep some in China for supplying China and surrounding markets, continue the India production, build some factories in the US to supply North (and possibly South) America, maybe put another in Europe or the UK to serve that market, etc. This would result in less shipping things all around the globe, and also make them more resilient against political problems around the world (wars and such, plus not having to tiptoe so much around the Chinese government).
If I were Apple upper management at this point, I'd have a large design group working on the design of the next factories and all the myriad issues that will raise.