Answer:
The imagery that Roosevelt uses in paragraph 12 of his speech is:
"Here destiny seems to have taken a long look."
This means that at that present the future which is termed destiny has been foreseen to be filled with potentials and possibilities.
Step-by-step explanation:
In literature, imagery is referred to mean the use figurative language as way of representing objects, actions, and ideas. These representations are done in such a way that it appeals to our physical senses. Imagery tends to use visual senses.
So, "Here destiny seems to have taken a long look" is an imagery. It reveals that what destiny has in store has been foreseen i.e they have foreseen the future.