No hope at all of the majority being able to, or feeling as though we must, purchase only things made entirely within the USA. It started with my ford truck from Canada, then john deere tractors with their yanmar diesels from Asia. Even what you think is American made is often not. I have paid more for high quality items made in the USA like my Peavy or kitchenaid mixer but the option is not commonly available if you are honest with yourself.
Look inside your Modine and see if the motors and circuit boards are also made in USA. There are several levels of "made in USA" and this can be discouraging if you really want something entirely made here starting with raw materials.