Answer:
1900: pneumonia, tuberculosis
2006: heart disease, cancer
This is due to the fact that there are cures for things like TB and treatments such as antibiotics, etc for things like pneumonia, even though the treatment can take a while it shortens the length, severity and helps a person get healthy again, cancer, on the other hand, is not curable and heart disease can worsen in seconds. Heart disease can lead to things like heart attacks, cardiac arrest, strokes, and many other things, also having a weak immune system can lead to the death of someone from such diseases.
Step-by-step explanation:
I currently take a nursing course and had to learn about the leading death causes in today's society and how to identify/treatment options for such diseases, the world is currently advancing thus creating a cure for things like TB. Medical practices have also changed in order to slow and/or stop the risk of spreading harmful bacteria to at-risk patients.