I said wheat too - soybeans never entered the equation. I did think "maybe wheat isn't the all american crop" which lead me to the show "The Americans" and led me to think, wouldn't it be ironic if it were a Russian crop originally..."
Kansas born & bred, daughter of a wheat farmer here. Yes, red and hard red winter wheat was introduced from Russia, Crimea, Ukraine. Mennonites brought it with them from those areas. https://www.holyokeenterprise.com/opinion/early-history-winter-wheat-central-plains for further edification.