Answer:
The central idea of President Abraham Lincoln's Gettysburg Address is that the sacrifices made by those who died in the Civil War were essential to preserving the principles of freedom and equality as articulated in the Declaration of Independence.
Lincoln used several rhetorical appeals and devices to support and develop this central idea. One notable rhetorical appeal is ethos, as he establishes his credibility and authority as the President of the United States. He refers to "our fathers" who created the nation, positioning himself as a leader who respects and upholds the principles upon which the nation was founded. This appeal to ethos enhances his persuasive power, as it aligns him with the nation's founders.
Lincoln also effectively employs pathos, appealing to the emotions of the audience. He does this by acknowledging the sacrifices made by the soldiers and their devotion to the cause. Phrases like "those who here gave their lives," "honored dead," and "last full measure of devotion" evoke a strong emotional response, emphasizing the gravity of the soldiers' sacrifices and the nobility of their cause.
Furthermore, Lincoln uses a powerful rhetorical device known as anaphora (repetition of a word or phrase at the beginning of successive clauses) with the phrase "It is for us." He repeats this phrase to stress the ongoing responsibility and dedication required from the living to ensure that the sacrifices of the fallen are not in vain. This repetition emphasizes the need for continued commitment to the principles of freedom and equality.
In conclusion, Lincoln's use of ethos, pathos, and anaphora in his Gettysburg Address effectively supports and develops his central idea, making a compelling case for the enduring significance of the soldiers' sacrifices and the nation's commitment to the principles of liberty and equality.