According to Lincoln, of the purpose of the Civil War was:

to bring forth a new nation dedicated to liberty.

to defend the Union against the attacks of the Confederacy.

to see if the United States can survive as a nation dedicated to liberty and equality.
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.

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According to Lincoln, the purpose of the Civil War was primarily to see if the United States can survive as a nation dedicated to liberty and equality. In his Gettysburg Address, he emphasizes that the war is a test of the nation's commitment to the principles of liberty and equality as outlined in the founding documents. The struggle is not only to preserve the Union but also to affirm the values upon which the nation was founded.