Yes, the US has a monopoly on growing food.
(subtext for dumb people: goddamn Red, you are one very dumb person)
Not sure what your point is....
Statistics drawn from the Food and Agriculture Organization of the United Nations (FAOSTAT) ranked the USA as the world's leading producer of sorghum, with a production total of 11.5 million metric tons. As a cereal, sorghum is the 3rd most produced grain in the country. The country has several regions that yield large sorghum harvests, including Colorado, South Dakota, Oklahoma, Texas and Kansas. Farmers mainly use the crop as livestock food and in the production of ethanol.
Next after the US is India at 7.5 million tons, Then Nigeria and Mexico. None of those countries is known to export significant quantities of Sorghum to China. The US does.
The United States exported about 4.8 million tons of sorghum, worth about $1 billion, to China in 2017, accounting for nearly all of China's imports of the grain last year, according to Chinese customs data.
So yeah, other countries grow sorghum, but China buys theirs mostly from the US. The sanctions are aimed at us, and will hurt midwest farmers pretty hard.