I know that adv is a US based forum, however many of the parts made for our bikes are made all over the world.
The Rick Motorrad electric 450w alternators are made in Taiwan by a company called emerald isle, they also produce the ND starter motors and replacement bean cans.
Most of the endurolast product lines are made outside of the US, including Poland (valeo starter motors), China endurolast own brand starters, Germany (Sacse ignition components) I don't know where the endurolast alternators come from, probably a mixture of Chinese and Italien parts.
I have nothing against against any of the products above and have used all except for the eurduralast alternators.
I suspect that a list of US made parts might be quite short, of small Artisan type products such as the Grok harmonisers and Toaster Tan products.
The situation here in the uk is fairly similar