Final answer:
The conditions that make populations more vulnerable to infectious disease include overcrowding and lack of access to clean water, improved sanitation and public health measures, and urbanization and technological advancements.
Step-by-step explanation:
The conditions that made populations more vulnerable to infectious disease are:
- Overcrowding and lack of access to clean water: when populations are crowded together and do not have access to clean water, it becomes easier for diseases to spread.
- Improved sanitation and public health measures: when sanitation and public health measures are not in place, it becomes harder to control the spread of diseases.
- Urbanization and technological advancements: the increase in population density due to urbanization and advancements in technology have made it easier for diseases to spread.
These factors have historically contributed to the vulnerability of populations to infectious diseases.