Contract negotiation is the process of give and take the parties go through to reach an agreement. Or, as they often say in business, "you don't get what you deserve; you get what you negotiate." ... For practical tips on tactics at the negotiating table, check out Nolo's article Contract Negotiation: 11 Strategies.
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.
A is correct because it’s pianissimo then Metso forte the fortissimo
