That doesn't mean that the rice we buy had been treated in the same way as rice sold in USA shops.
There is a big difference in the nutritional content of white vs brown rice, lots of difference in vitamins (hence the US FDA mandating added vitamins for white rice).
I'm surprised at the range that corn was used in the USA, because even on the eastern seaboard you go from very dry warm maritime climate to dank humid and very cold. Shows how versatile a crop it is.