What type of scenario would most likely result in the increase of a country's mortality rate?

A country's mortality rate is most likely to increase in scenariOS involving widespread health crises, such as pandemics or epidemics, where Infectious Diseases spread rapidly and overwhelm healthcare systems. Additionally, natural disasters, armed conflicts, economic collapse, or significant environmental changes can lead to increased mortality due to injuries, lack of medical care, malnutrition, or poor living conditions. Social factors, like poverty and lack of access to healthcare, can further exacerbate these situations, leading to higher mortality rates.