The above can be rearranged as thus: This nation was built on the principles of liberty and equality. The best way to honor the fallen soldiers is to continue to fight for the principles of liberty and equality. It is proper to dedicate part of the battlefield to be a cemetery. It is the summary of the Gettysburg Address.
The Gettysburg Address is a speech delivered in 1863 by U.S. President Abraham Lincoln at the dedication of the National Cemetery at Gettysburg, Pennsylvania, the site of one of the most decisive battles of the American Civil W.a.r.
Therefore, the correct answer is as given above
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