Kudos for you for valuing a car's interior as it is what you look at most of the time, not the exterior. It sounds like you have done your homework. In the small hatchback class, the Mazda 3 and VW Golf probably have the nicest interiors of the bunch. Thoughtfully laid out and high quality materials. Golf's get very good mileage. Prius's are a good choice, but the interiors are certainly more utilitarian. If you have other VW dealers in the area, you might try harder on finding a Golf, although in America they are certainly more interested in pushing the Jetta. The interiors are Audi quality and they are somewhat tall and boxy and have good headroom.
I'm not familiar with how nice the Kia's interior is, but the tall shape might be nice for your tall husband.
As far as American made I believe Ford and GM make their small cars in Mexico, as does VW and Mazda. For 2017, Subaru Impreza's moved production to Lafayette, Indiana, so this might be your best choice. The Crosstrek version is a bit taller and might be easier for your husband to get in and out of. The Eyesight driver assist is optional and adds blind spot detection. Subaru's traditionaly have had cheap interiors, but supposedly for the 2017 model, the Impreza has a much improved interior design.