Final answer:
World War II was the first conflict to be widely reported through radio, changing the dynamics of wartime journalism and news broadcasting.
Step-by-step explanation:
The first war to be reported through the radio was World War II. This conflict changed radio news forever, particularly with the German annexation of Austria and the subsequent events in Europe during the 1940s. The need for frequent news updates due to the rapidly evolving situation made the once-a-day printing of newspapers inadequate. People desired immediate information, leading to live radio reporting by journalists like Edward R. Murrow of CBS, who reported on Germany's actions from various European locations, including during aerial bombings of London. To maintain operational security, the White House enacted guidelines limiting the reporting of classified information, which broadcasters voluntarily adhered to.