So I guess they import the beans, manufacture the tofu, then ship it back to us? Sounds inefficient, though I'm not sure how much demand there is for a large-scale domestic tofu manufacturing industry in the US.
US Tofu is by and large for animal feed or oil, not tofu.
Soy, you mean?
Trans-oceanic shipping is actually incredibly cheap that companies will do things like this if they are able to save a bit of money