Hello. You did not inform the poem to which this question refers, which makes it impossible for it to be answered accurately. However, I will try to help you in the best possible way.
The use of similes and metaphors in a poem is done with the objective of extending the meaning of the message that the poet wants to pass through the poem, therefore, the poet writes comparisons that present new and deeper and more imposing meanings.
The sentence is drawing a parallel between the two parties' reasons for going to war. Each of them is associated with a verb: one with "survive," the other with "perish." They are the two antonyms.
Antonyms are words which have opposite meanings. <em>Survive </em>means to contine living, and <em>perish </em>means to stop living.
What Lincoln meant by using this antonym-based parallelism is that the Confederacy fought to end the exisiting nation (meaning, to secede from the North and create a new nation), while the Union fought to keep the nation alive by preventing it from splitting.
Answer:
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Explanation:
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