You just said government would lift tariffs. Most of the land would go to a monoculture for export. The only land that would grow diverse foods for domestic consumption would be to cater to the demand for local consumption. And in the world where government lifted tariffs, we must assume that they acted in representation of the people, so that demand mustn't be so high.
The food you eat as a wealthy person is probably in a good part produced in other parts of the world due to cheap labor. Sure we provide lots of corn and and soy but a lot of that is for export fuel and meat production