The birth of the modern is of course marked by the long wars, where not only where there new ways of killing, but new ways of reporting the killing. Again the portable typewriter, the small format camera, allowed a change in the nature of journalism, especially when coupled with reasonably efficient communications.
The tipping point for this was perhaps the Spanish civil war where there was something resembling modern reporting with community of serious journalists such as Orwell whose despatches commanded attention as did many of the photographers of the time …
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