The correct answer is " the dedication of a cemetary "
Explanation
It is a speech that U.S. President Abraham Lincoln delivered during the american civil war at the dedication of the Soldiers' National Cemetery in Gettysburg, Pennsylvania on the afternoon of Thursday, November 19, 1863.
In this speech Lincoln described the USA as a nation " conceived in Liberty, and dedicated to the proposition that all men are created equal," and represented the Civil War as a test that would decide whether such a nation, the Union sundered by the secession crisis,could endure.
He exposed the sacrifices of those who died at Gettysburg in defense of those principles, and exhorted his listeners to resolve that these dead shall not have died in vain,that this nation, under God, shall have a new birth of freedom" and that government of the people, by the people, for the people, shall not perish from the earth.