The global transfer of disease in the pre-modern world helped in the colonisation of the Americas because the Native American Indians were not immune to the diseases that the settlers and colonisers brought with them. The Europeans were more or less immune to small pox, but the Native Americans, having been cut off from the rest of the world for millions of years, had no defence against it. These germs killed and wiped out whole communities, paving the way for foreign domination. Weapons and soldiers could be destroyed or captured, but diseases could not be fought against.
