Echoes of past decisions and the style of their announcement.
At one time, leaders announced things with a voice of great magnitude, depth and solidity.
Listening to the earliest recordings of these there was something equivalent to an etched-in-granite milestone, a moment in history.
The timbre and sonic resonance of these missives was not as important as the content, the statements being made for better or worse, but that quality often has more effect than the subject addressed or choices made.
How anything is said, the words chosen, mean – almost – everything. Then with vocal delivery, add in tone of voice for complete effect.