If the federal government was not paying farmers to grow corn a lot of the corn land would be producing two crops of wheat each year. Since it cost less to grow.
Are you a farmer?
Again, wheat doesn’t yield as much, and you have failed crops much more often than corn.
Not all land in this country is best suited for wheat ~ at the same time much of the land best suited for corn is also devoted to roads, houses, and various public construction projects.