Aerospace, petroleum, and automotive industries
The farming of maize began in Mesoamerica in 6000 B.C.
The domestication of maize made the city of Tenochtitlan possible by providing the Aztecs the ability to feed millions. Unlike the corn that is known today, the early maize had tiny cobs but dramatically became bigger and more nutritious as time passed.
Steel, concrete or a combination of both.
