Which ice of persuasion does president roosevelt use to appeal to his audience

This is an interesting question to ask,

President Roosevelt's mode of persuasion was "Ethos" this type of persuasion always  involves the personal character of the speaker who is speaking.

Moreover, President Roosevelt  was the 32nd president of the America , he served as president from 1933 to 1945. His full name was " Franklin D. Roosevelt".  The scholars in America rated the Roosevelt very high and ranked him with one of the greatest presidents of american history.

- "the basic difference between keywords and subjects is that subjects (or "subject headings") have been predetermined, while keywords have not. a keyword is an easy place to start because you can use any word that seems to fit your search; this is called "natural language" searching."