玉米。

玉米不是神选，不是天赐，而是印第安古文明用大刍草培育出来，在墨西哥的特瓦坎谷驯化产生的。

订正：本答案有误。

虽然以前的观点认为玉米最早是特瓦坎谷(Tehuacán Valley)驯化的。

但现在根据最新考古发现，认为是在特瓦坎谷西方的巴尔萨斯河谷(Balsas River Valley)驯化的。

（Maize – Wikipedia）The domestication of maize is of particular interest to researchers—archaeologists, geneticists, ethnobotanists, geographers, etc. The process is thought by some to have started 7,500 to 12,000 years ago. Research from the 1950s to 1970s originally focused on the hypothesis that maize domestication occurred in the highlands between the states of Oaxaca and Jalisco, because the oldest archaeological remains of maize known at the time were found there. Genetic studies, published in 2004 by John Doebley, identified Zea mays ssp. parviglumis, native to the Balsas River valley in Mexico's southwestern highlands, and also known as Balsas teosinte, as being the crop wild relative teosinte genetically most similar to modern maize.[68] This was confirmed by further studies, which refined this hypothesis somewhat. Archaeobotanical studies, published in 2009, point to the middle part of the Balsas River valley as the likely location of early domestication; this river is not very long, so these locations are not very distant. Stone milling tools with maize residue have been found in an 8,700 year old layer of deposits in a cave not far from Iguala, Guerrero.[69][70][71]