Globalization and disease Eurasian diseases to the Americas was that many more native peoples were killed by disease and germs than by the colonists' use of guns or other weapons. Scholars estimate that over a period of four centuries, epidemic diseases wiped out as much as 90 percent of the American indigenous populations. In Europe during the age of exploration, diseases such as smallpox, measles and tuberculosis (TB) had already been introduced centuries before through trade with Asia and Africa. People had developed some antibodies to these and other diseases from the Eurasian continent. When the Europeans traveled to new lands, they carried
Indigenous Australians island and the rest of mainland Australia during the last glacial period. Estimates of the population of the Aboriginal people of Tasmania, before European arrival, are in the range of 3,000 to 15,000 people although genetic studies have suggested significantly higher figures, which are supported by Indigenous oral traditions that indicate a reduction in population from diseases introduced by British and American sealers before settlement. The original population was further reduced to around 300 between 1803 and 1833 due to disease, warfare and other actions of British settlers. Despite over 170 years of debate over who or what was responsible