Answer:
To promise uninterrupted continuation of the previous administration's duties and struggles ⇒ Paragraph 1
Paragraph 1 talks about how the country must continue to push forward to accomplish what the previous administration of Franklin D. Roosevelt had sought to accomplish.
To remind all Americans to stay engaged in the effort to secure peace and liberty worldwide. ⇒ Paragraph 2
The speaker here talks about how Americans must lead the world in ensuring that peace and liberty reign worldwide by being a shinning beacon and role model for the world.
To warn that only the victors can dictate how peace is established and how justice is carried out ⇒ Paragraph 4
This paragraph talks about how the opponents of peace - Nazi Germany and Italy - would be punished for transgressing against the laws of God and man and how 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
This paragraph talks about how only unconditional surrender could bring about victory as it would represent total victory over Nazi Germany and Japan.