Incorrect, only Maverick 88 parts are made in Mexico, Mossberg 500 Series parts are made in New Haven Connecticut.
As previously stated in the very message you quoted but evidently didn't read all the way through prior to replying to, because the Mossberg 590 has an objectively superior control layout which allows the shooter to work both the safety and bolt release without breaking their grip. Furthermore, parts such as the extractor can be replaced by the end user because they are secured with simple screws, whereas the Remington 870 has the extractor riveted into place, so if it breaks you have no choice but to send it into the factory for repairs, which is a bigger issue than ever now that they're out of production.
Another thing that I forgot to mention before is that the Mossberg 590 comes from the factory with a drilled and tapped receiver.
Besides, I never said that the Remington 870 should be a rebranded Mossberg 590 clone, merely that it ought to be redesigned with a control layout similar to the Mossberg 590 which can be accessed by the shooter's hand without having to break their grip, and that parts ought to be screwed into place rather than riveted.