Answer:
Reagan's use of a rhetorical technique to convey his message is in the way that His use of repetition in the last paragraph emphasizes his message of change.
Step-by-step explanation:
The last part of the speech not only emphasizes his message of change but it also emphasizes to whom he is speaking and what he considers has to be done to demonstrate that there is a real change coming from the Soviet Union to the world, he stresses the last lines to make a precise statement about who and how is the way to have security and freedom.