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Probably the most important crop to originate from North and South America is maize, which is commonly known today as corn. It is thought that corn was cultivated at least 10,000 years ago from a plant called
teosinte in the Americas. The Mayans regarded corn as a sacred crop and it was brought back by Christopher Columbus when he returned to Spain
Corn became very valuable when it returned to the Old World spreading to Europe, the Middle East, and had a huge impact in Africa. It is speculated that corn became the primarily food staple in Africa due to its growing habits. Today, corn is used in pretty much everything from food, to sweeteners, to even fuels such as ethanol. It is also the main food source for over 200 million people in the world today.