#1 Before the Columbian Exchange the Old World hadn’t seen a tomato #2 Old World animals expanded the food supply in the New World #3 Horses changed the lifestyle of many Native American tribes #4 Many Native American tribes were wiped out due to the Columbian Exchange #5 Smallpox Epidemics in the New World were more deadly than Black Death #6 Columbian Exchange led to a huge increase in population in the Old World #7 New World crops have become hugely popular in the Old World #8 Ireland became so reliant on potatoes that it led to the Great Potato Famine #9 Columbian Exchange led to the horrors of the Atlantic Slave Trade #10 Columbian Exchange has led to the extinction of many species