Population (millions of people) 120 110 8 SO 70 60 50 1000 1100 1200 1300 1350 1. Healthy population 2. Bubonic Plague 3. Spanish Flu 1650 1400 1500 1600 1700 Year According to the graph and your knowledge of world history, what accounts for the decline in population between 1350 and 1550?