Native populations in Spanish colonies declined due primarily to European diseases and brutal treatment they received. What primarily caused this decline?

• A. European diseases
• B. Drought
• C. Earthquakes
• D. Native resistance to colonization

Answer: (A)

The main factor behind the decline is the spread of European diseases to which Indigenous peoples had no prior exposure or immunity. After contact, illnesses like smallpox, measles, influenza, and others swept through native populations, causing extremely high mortality rates and drastic demographic collapse. This disease roundly outpaced other hardships and reshaped societies, weakening communities and making them more vulnerable to other pressures. While harsh treatment and forced labor contributed to suffering, they did not cause the vast, population-wide losses seen from infectious diseases. Droughts or earthquakes could cause local trouble, but they don’t explain the widespread, dramatic decline the way introduced diseases do.