In the New World, domestic animals were not common and therefore most meat was hunted and scavenged, whereas in the Old World , domestic animals such as cows, horses, pigs, etc. were very common in villages of the same stature as those in the Americas, so the lifestyles were different with different habits. Additionally, the epidemiological imbalance stemmed from the number of diseases originating from the Old World and its domestic animals compared to diseases found in the Americas. Overall, the old world, Europe, had many more easily transmitted diseases. Furthermore, Mann considers the imbalance of diseases to be the most important fact in world history, because when these diseases were transmitted to the Americas, they dictated the first 150 years of the lives of Native Americans, like so many others have been.