Final answer:
Roosevelt's 'Four Freedoms' speech conveyed the message that people worldwide should have necessary and basic freedoms. The four freedoms mentioned were freedom of speech, freedom of worship, freedom from want, and freedom from fear. Roosevelt envisioned a world where nations would come together to ensure these freedoms for all.
Step-by-step explanation:
The theme of Roosevelt's 'Four Freedoms' speech was that people everywhere should be allowed necessary and basic freedoms. He outlined these freedoms as freedom of speech, freedom of worship, freedom from want, and freedom from fear. Roosevelt believed in a world where all nations would enjoy these essential human freedoms, promoting economic understandings and a reduction of armaments to achieve lasting peace.