Answer:
To promise uninterrupted continuation of the previous administration's duties and struggles ⇒ Paragraph 1
The first paragraph shows that the current (at the time) administration of President Truman would keep on fighting for the same ideals that the previous administration of President Roosevelt did.
To remind all Americans to stay engaged in the effort to secure peace and liberty worldwide. ⇒ Paragraph 2
The second paragraph talks about how Americans should stay engaged in seeking peace and liberty for all mankind by being a shinning light to the rest of the world of a nation that is deeply devoted to the highest ideals.
To warn that only the victors can dictate how peace is established and how justice is carried out ⇒ Paragraph 4
The fourth paragraph shows that the criminals of the Nazi German and Japanese Military dictatorships will be punished for their actions but this can only be done by the victors.
To clarify that an end to the present world conflict can only come with complete allied victory. ⇒ Paragraph 3
Paragraph 3 shows that the administration of President Truman would be completely devoted to destroying all resistance and would only accept total victory.
