It suggests that Americans are in danger of losing their rights.
It predicts that the enemy will try to take away free speech.
It implies that the US will lose the war if Americans do not buy war bonds.
A memoir is much like a self reflection that tells anecdotes from the author's past. Neil Armstrong who was the first man to land on the moon, would most likely have a memoir focused on his training and his experience flying in outer space and walking upon the moon's surface.