Premise: The Cold War led to increased international broadcasting, as Communist and non-Communist states attempted to influence each other's domestic population. In addition to the U.S.-Soviet cold war, the Chinese-Russian border dispute led to an increase of the numbers of transmitters aimed at the two nations, and the development of new techniques such as playing tapes backwards for reel-to-reel recorders.
Hypothesis: Radio use increases during wars.
Label: neutral