Which historical document is known for its famous opening line, "Four score and seven years ago"?

The statement "Four score and seven years ago" is the renowned opening line of the Gettysburg Address, delivered by President Abraham Lincoln during the Civil War in 1863. This phrase means "eighty-seven years ago" and refers to the founding of the United States, specifically highlighting the year 1776 when the Declaration of Independence was signed. The Gettysburg Address emphasizes themes of democracy, national purpose, and the sacrifices made by soldiers, providing a poignant reflection on the nation's values and the importance of unity. Its eloquent language and historical significance have made it one of the most quoted speeches in American history, underlining the ideals of freedom and equality.