America is good at growing corn and they sure do grow a lot of it!
But most American corn differs from corn grown in other countries.
In America, most of the corn grown is a high starch variety that tastes horrible unless it's heavily processed!
So unlike in other countries like South Africa, where you can pick and eat corn right off the land, American corn is literally grown to be processed.
Corn is not a vegetable at all. It's actually a grass and evolved from a grass in Mexico known as the teosinte. Teosinte can actually cross-breed with modern maize varieties to form maize-teosinte hybrids that can go on to reproduce naturally.
Although there is very little health benefits in corn, it is the main ingredient in almost all food in the US. It's used in additives, and High Fructose Corn Syrup has replaced sugar as a sweetener because it is not only sweeter, but also a lot cheaper.
Unfortunately this is very unhealthy, as it raises blood sugar levels much faster and your body converts it to fat faster than any other type of sugar.
In the US 86% of all corn grown is genetically modified—32% is converted into ethanol, 18% is for food additives and 50% is grown to feed animals that will later be served as meat.