Final answer:
The figure of speech in the statement 'No vested power in this great day and land Can gag or throttle' is a metaphor.
Step-by-step explanation:
The figure of speech in the statement 'No vested power in this great day and land Can gag or throttle' is called a metaphor.
A metaphor is a figure of speech that compares two different things by stating that one thing is something else.
In this case, the speaker is using the metaphor of 'gag or throttle' to describe the idea that no power can silence or suppress the freedom and independence of the people.