The columbian Exchange
by:zachary jacobs


The contrast between the two sets of organisms, Old World and New World, those closely associated with humanity—crop plants, domesticated animals, germs, and weeds—was very sharp. The difference between the two lists of crops was, with the possible exception of cotton, absolute.More astonishing than the difference between the length of the lists of Old World's and New World's domesticated animals is the difference between the lengths of the lists of infectious diseases native to the two. The New World had only a few, possibly because humans had been present there and had lived in dense populations, cities, for a short time compared to the Old. Possibly of greater importance is the relative lack of domesticated herd animals in America, one of our richest sources of disease micro-organisms. (For instance, we share influenza with pigs and other barnyard animals)More astonishing than the difference between the length of the lists of Old World's and New World's domesticated animals is the difference between the lengths of the lists of infectious diseases native to the two. The New World had only a few, possibly because humans had been present there and had lived in dense populations, cities, for a short time compared to the Old. Possibly of greater importance is the relative lack of domesticated herd animals in America, one of our richest sources of disease micro-organisms. (For instance, we share influenza with pigs and other barnyard animals).There were infections in the New World before 1492 that were not present in the Old (Chargas' disease, for instance). There were those it shared with the Old World, certainly one or more of the treponematoses (a category including syphilis) and possibly tuberculosis; but the list is short, very short. When we list the infections brought to the New World from the Old, however, we find most of humanity's worst afflictions, among them smallpox, malaria, yellow fever, measles, cholera, typhoid, and bubonic plague

we wouldnt  have snickers candy if it wouldnt have been for new trading cocoa  and milk and sugar.

1.guns

2.germs

3.steel

Exchange between the old and new world