(A) The Confederate States of America
(B) The Union
(C) The Union States of America
(D) ** The United States of America
EXPLANATIONS BELOW
Concept note-1: -Lincoln was declaring that the United States would continue to fight to preserve the nation that was created by the Founding Fathers who wrote the Declaration of Independence in 1776.
Concept note-2: -“Four score and seven years ago our fathers brought forth on this continent, a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal. Now we are engaged in a great civil war, testing whether that nation, or any nation so conceived and so dedicated, can long endure.”