In World War 2 radio was very important. Edward Murrow broadcast regularly from London. TV has taken over this function. Affiliate stations carry some news but not much. No local news is carried by local commercial stations.
Public radio is the exception and it does an excellent job.
It covers local events very well. Not much local news though. All they achieve it creating social tension and degrading women and minorities such as Native Americans, African Americans, etc. Most talk radio is pure entertainment, not very informative, and very one-sided. In 1926 the National Broadcasting Corporation, or NBC was formed from RCA, GE and Westinghouse, began programming.