Anadiplosis is a powerful rhetorical device. The speaker begins a sentence or clause by repeating the last word or words of the previous sentence or clause. In essence, A leads to B, B leads to C, C leads to D.
The repetition of the words adds rhythm and cadence. Anadiplosis often builds in intensity to a climax.
In this 2016 speech, Barack Obama uses anadiplosis towards the end of his speech to reach a crescendo with his audience.
For more examples of anadiplosis, please see: mannerofspeaking.org/2012/02/...
CREDITS
1. Music - “Anthem of Inspiration | Piano Orchestral Background Music” by RomanSenykMusic - • Anthem of Inspiration ... - Creative Commons
2. Video clip of a speech by Barack Obama on 7 November 2016 in Durham, New Hampshire. The speech has been shown on numerous news channels and other online sources. It is being used under the Fair Use Doctrine for the following reasons: (a) the clip is short; (b) it was a public speech; (c) the clip is being used for educational purposes to demonstrate the use of a rhetorical device; and (d) nobody is being deprived of the ability to earn income from it.