Which technological advancement most strongly affected a leader's speech during world war ii?

I believe the answer is: The Radio

Prior to the development of radio, the leader's speech is limited for the people who are physically present in the building or the field where the speech is given.

After the development of radio, the leader's speech could be heard from various places all over the nation.

jenkins wanted the narrator to write a ghost story for his magazine. he wanted the narrator to give the readers a story based on the supernatural. he wanted him to give the readers real 'horror' stories and not the type of live ghosts which he had presented in his earlier stories.

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