drugs
It probably does not. It is the organism that causes "swine flu", and caused an epidemic that took place in 2009.
it gave us freedom
not good
If there is an epidemic then you may be a part of the society, similarly if the standards and quality of life is backward in your society then there are disease that will affect you like malaria,dengue.
The government
chaos
WW2 affected American life from japan bombing Hawaii than USA got Hawaii
All African Americans were slaves.
scurvy
The effect of influenza virus was severe to the extent where average life span in US was depressed by a period of 10 years.
Without rivers and or lakes, life cannot be supported. Without water, there would be absolutely no life on Earth.
Such as the American Revolution, and The Great Awakening. Those both affect and have affected America throughout her life.