Franklin Delano Roosevelt: Pearl Harbor Address - Choice of Lexis

I have created a representative image of Roosevelt’s speech.

The size of the words indicates their frequency in the speech but also the importance that they have in it.

Firstly we find many times the verb “to attack” ( also we find attack as noun): ”Japan/Japanese forces attacked. We can understand that Roosevelt wants to underline the violence of Japan.

Secondly the verb is often juxtaposed with the adverb “deliberately”:  “the United States of America was suddenly and deliberately attacked […]”; “that the attack was deliberately planned […]”. It means that the attack is voluntary and sought.

Then we can see how the word “peace” is always linked with The United States: “The United States was at peace with that nation and, at the solicitation of Japan, was still in conversation with its government and its emperor looking toward the maintenance of peace in the Pacific”.

To put in other way Roosevelt's purpose is tell that USA are the “good” (he nominates God’s help) while Japan is the “evil”. About Japan he uses the sentence “false statements and expressions of hope for continued peace”.  Very strong is the word “false”, because it describes how for Roosevelt Japan is false and liar. But he doesn't directly say it.
For these reasons he says: “the American people in their righteous might will win through to absolute victory[…] will gain the inevitable triumph”.

Semantic fields:
America and its people (Usa, Americans, congress, people);
Japan and its people (The empire of Japan, Japanese forces);
War/Enemy (air and naval forces);
Geopolitics (Pacific see/area, Guam, Hong Kong, and so forth).

Finally, in my opinion, in this way he wants to justify his decision to respond to the attack of Japan.

V.