When a US factory burns down and kills all the employees inside because they'd been locked in during their 15 hour shift - which has happened more than once in Bangladesh - you can say that US factories are similar to Bangladeshi factories.
I agree that conditions for many workers suck, but let's not pretend there's much similarity.
I give you the Triangle Shirtwaist Factory fire in New York City, killing 146 garment workers. Same general gist, even: doors were locked by management from the outside "to prevent pilferage and unauthorized breaks".
https://en.wikipedia.org/wiki/Triangle_Shirtwaist_Factory_fi...
Lots of things have happened in the US since 1911.
Factory fires killing employees still happen in Bangladesh.
You're right that there are better protections in the USA. But day-to-day conditions are not so great--there's nothing particularly abnormal about 15-hour shifts, or people who would lose their jobs for refusing them.
Incidentally, many of the complaints against Chinese/Bangladesh/etc. factories could also be leveled against US factories per my experience. Other than the child labor bit, I've seen just about everything here, too, though I expect some of the problems are simply more widespread and occur more frequently.
Factory managers know that their employees don't have a lot of options and tend to squeeze them hard. (Then collect bonuses for cost savings...) It was always amusing to hear them tell the crew how great it was that labor expenses were down. And yes, I did point out afterwards to the people that "labor expenses" === "your paychecks." For whatever reason, this was not obvious to some.