This would mainly come from the medical information that we now have. Back then, smoking (for example) was normal and definitely not considered unhealthy. Now we know that smoking is terrible for you.
Along with that, we're closer to solver cancer than ever, there is more help for suicidal people, and technology is advancing so quickly to help us solve medical issues.
I would definitely say that the main factors for this increase are our newfound knowledge and technology helping us along the way.
The UN emerged in 1945 in response to tragic events of World War II. The UN emerged as a result of agreements made at the end of World War II (1939-1945) between the Allied powers. “Soviets, Americans, and Britons Drew the Postwar World Political Map.
They should research from reliable sources