Sneakers not made is sweatshops

Looks to me like the question in the OP is just, “Are there any shoe companies with factories only in the USA?”

The answer to that would seem to be, “Yes–New Balance, although they do use some components that are manufactured overseas.” Look at the FTC link.

But not all of their shoes are manufactured in the USA. They list those that are here, but this list does not include the whole NB lineup. In fact, this article from the February/March 2001 issue of MIT’s Boston Review says:

And the Jobs With Justice website says: