al changes conveyed by The Columbian Exchange were not economic, social or political but biological in nature. In his book, he spoke very persuasively about the changes in the Old World and the New World. Crosby started the story by explaining the contrast between the Old and the New Worlds. Before the voyage of Columbus both worlds were totally different but "The two worlds, which God had cast asunder, were reunited, and the two worlds, which were so very different, began on that day to become alike" (Crosby 3).
According to Crosby "there are many explanations for the European success in America" (Crosby 35), for example, steel over stone, cannons, and firearms over bows and arrows, and lack of unity among the Indians. Crosby explains the transportation of plants and animals from the Old World to the New World positively. The main items traded from the Old World to the New World were the alphabet, horses, and a novel technique of harvesting. European thought the natives about the alphabet so that they can communicate with them. The plants traded to The New World by the Europeans tripled cultivatable plants. "There is a great advantage in having a large variety of food plants"(Crosby 107) but "more important than the plants brought to America by Columbus and his followers are animals they brought" (Crosby 108).
According to Crosby "The first contingent of horses, dogs, pigs, cattle, chickens, sheep, and goats arrived with Columbus on the second voyage in 1493" (Crosby 75). Europeans taught the nativ...