It’s a compilation of labor laws, minimum wage, regulations, and unions that make it impossible for some products to be made here. Because of all of these things, almost everything you find in the United States is now made in China or another country that does not have problems with any of those things.
It used to be that only cheap and low end items were made overseas but because of how inefficient and restricted US businesses have become, we’ve began heavily importing even high-end electronics from over seas. A lot of businesses that used to be US based have actually closed facilities here and re-opened them in another country.
I hope this helps!