This is based on the spoil system which explains or is been described as a system where campaign workers of the sitting government are been offered civil service positions as compensation to their endeavours during the campaigns/rally. This is sometimes referred to as the patronage system too. That is why jobs and government positions gained through this system are expected to contribute a percentage of their salaries. Changes in party that are in control of government sometimes also brings new government workers carrying political responsibility.
Silent Spring was written in 1962 by Rachel Carson. She was an American Conservationist and a Marine Biologist and is accredited with being an inspiration to the global environmental movements.
