In 2010 president obama signed the affordable care act into law. fox news and cnn presented vastly different viewpoints on the aca, appealing to either conservative or liberal viewers, respectively. the media's handling of this law is an example of:

I believe the answer is culture war.
Culture war refers to the clash between different values that might influence the popular style of government in a country.
The existence of media bias such as Fox and CNN happens only because they're feeding of from the opportunity to ponder a certain group of people to attract advertising market.