It's a little hard to find product made in the US right now. I sell a lot of the TOTO that is manufactured in Georgia here in the US.
Ultramax II and what seems to be the other product from TOTO with the "II" after the name.
I never cared for the Mansfield Alto. That was a builder grade version that I remove a lot.
Lately around the Seattle area, the new ones seemed to have vanished.
If you go Mansfield, the Maverick would be fine.
Stay away from their pressure assist dual flush though. The Chinese EcoFlush doesn't seem to hold up.
In 2007, Bain Capital bought out three major plumbing companies and consolidated manufacturing, shutting down some US locations. That was American Standard, Crane and Eljer.
Gerber, which had been a family owned business based out of Chicago was bought by a Chinese company, and that manufacturing went overseas.
Kohler makes some product in the US too, as well as some imports.