Final answer:
The southern wall of the Lincoln Memorial is carved with Abraham Lincoln's Gettysburg Address, one of the most significant speeches in American history, emphasizing the values of equality and freedom.
Step-by-step explanation:
The southern wall of the Lincoln Memorial is carved with the words of President Abraham Lincoln's Gettysburg Address. This historic speech was delivered after the Battle of Gettysburg during the American Civil War and is a tribute to the Union soldiers who died there. The Gettysburg Address is considered one of the most significant speeches in American history, underscoring the values of equality and liberty and reaffirming the purpose of the Civil War.