Question: What was the main subject of the book named for the author of Four Score and Seven Years Ago?

full_context: Document 1: Abraham Lincoln: Lincoln's declared philosophy on court nominations was that "we cannot ask a man what he will do, and if we should, and he should answer us, we should despise him for it. Therefore we must take a man whose opinions are known." Lincoln made five appointments to the United States Supreme Court. Noah Haynes Swayne was chosen as an anti-slavery lawyer who was committed to the Union. Samuel Freeman Miller, supported Lincoln in the 1860 election and was an avowed abolitionist. David Davis was Lincoln's campaign manager in 1860 and had served as a judge in Lincoln's Illinois court circuit. Democrat Stephen Johnson Field, a previous California Supreme Court justice, provided geographic and political balance. Finally, Lincoln's Treasury Secretary, Salmon P. Chase, became Chief Justice. Lincoln believed Chase was an able jurist, would support Reconstruction legislation, and that his appointment united the Republican Party.
Document 2: Abraham Lincoln: Vampire Hunter: Disappointed, Lincoln decides to abandon his mission. However, Adam learns of his activities and kidnaps Johnson to lure Lincoln into a trap at his plantation. Adam captures Lincoln and tries to recruit him, revealing his plans to turn the United States into a nation of the undead. Speed rescues his friends, and they escape to Ohio.
Document 3: United States Declaration of Independence: The United States Declaration of Independence is the statement adopted by the Second Continental Congress meeting at the Pennsylvania State House (now known as Independence Hall) in Philadelphia on July 4, 1776. The Declaration announced that the thirteen American colonies at war with the Kingdom of Great Britain would now regard themselves as thirteen independent sovereign states no longer under British rule. With the Declaration, these states formed a new nation -- the United States of America.
Document 4: How the West Was Won (film): George Peppard as Zeb Rawlings Andy Devine as Corporal Peterson Harry Morgan as Gen. Ulysses S. Grant John Wayne as Gen. William Tecumseh Sherman Russ Tamblyn as Confederate deserter Raymond Massey as President Abraham Lincoln
Document 5: Gettysburg Address: Beginning with the now - iconic phrase ``Four score and seven years ago ''-- referring to the United States Declaration of Independence in 1776 -- Lincoln examined the founding principles of the United States as stated in the Declaration of Independence. In the context of the Civil War, Lincoln also memorialized the sacrifices of those who gave their lives at Gettysburg and extolled virtues for the listeners (and the nation) to ensure the survival of America's representative democracy: that`` government of the people, by the people, for the people, shall not perish from the earth.''
Document 6: Lincoln (novel): Set during the American Civil War, the novel describes the presidency of Abraham Lincoln through the eyes of several historical figures, including presidential secretary John Hay, First Lady Mary Todd Lincoln, Secretary of State William H. Seward, Secretary of the Treasury Salmon Chase, his daughter Kate Chase, U.S. Representative Elihu B. Washburne, and conspirators John Wilkes Booth and David Herold.
Document 7: Gettysburg Address: Four score and seven years ago our fathers brought forth on this continent, a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal.
Document 8: American Civil War: The American Civil War (also known by other names) was a war fought in the United States from 1861 to 1865. As a result of the long - standing controversy over slavery, war broke out in April 1861, when Confederate forces attacked Fort Sumter in South Carolina, shortly after U.S. President Abraham Lincoln was inaugurated. The nationalists of the Union proclaimed loyalty to the U.S. Constitution. They faced secessionists of the Confederate States, who advocated for states' rights to expand slavery.
Document 9: United States Declaration of Independence: The United States Declaration of Independence is the statement adopted by the Second Continental Congress meeting at the Pennsylvania State House (Independence Hall) in Philadelphia on July 4, 1776, which announced that the thirteen American colonies, then at war with the Kingdom of Great Britain, regarded themselves as thirteen independent sovereign states, no longer under British rule. These states would found a new nation -- the United States of America. John Adams was a leader in pushing for independence, which was passed on July 2 with no opposing vote cast. A committee of five had already drafted the formal declaration, to be ready when Congress voted on independence.
Document 10: Uncle Tom's Cabin: Uncle Tom's Cabin; or, Life Among the Lowly, is an anti-slavery novel by American author Harriet Beecher Stowe. Published in 1852, the novel had a profound effect on attitudes toward African Americans and slavery in the U.S. and is said to have "helped lay the groundwork for the Civil War".Stowe, a Connecticut-born teacher at the Hartford Female Seminary and an active abolitionist, featured the character of Uncle Tom, a long-suffering black slave around whom the stories of other characters revolve. The sentimental novel depicts the reality of slavery while also asserting that Christian love can overcome something as destructive as enslavement of fellow human beings.Uncle Tom's Cabin was the best-selling novel of the 19th century and the second best-selling book of that century, following the Bible. It is credited with helping fuel the abolitionist cause in the 1850s. In the first year after it was published, 300,000 copies of the book were sold in the United States; one million copies in Great Britain. In 1855, three years after it was published, it was called "the most popular novel of our day." The impact attributed to the book is great, reinforced by a story that when Abraham Lincoln met Stowe at the start of the Civil War, Lincoln declared, "So this is the little lady who started this great war."  The quote is
Document 11: Four Chords & Several Years Ago: Four Chords & Several Years Ago is the seventh album by American rock band Huey Lewis and the News, released in 1994. The title is a play on the first sentence in Abraham Lincoln's Gettysburg Address ("Four score and seven years ago ...").
Document 12: American Civil War: The American Civil War (also known by other names) was a war fought in the United States (U.S.) from 1861 to 1865. The Civil War is the most studied and written about episode in U.S. history. Largely as a result of the long - standing controversy over the enslavement of black people, war broke out in April 1861, when secessionist forces attacked Fort Sumter in South Carolina, shortly after United States President Abraham Lincoln was inaugurated. The loyalists of the Union in the North proclaimed support for the Constitution. They faced secessionists of the Confederate States in the South, who advocated for states' rights to uphold slavery.
Document 13: United States Declaration of Independence: Conclusion The signers assert that there exist conditions under which people must change their government, that the British have produced such conditions and, by necessity, the colonies must throw off political ties with the British Crown and become independent states. The conclusion contains, at its core, the Lee Resolution that had been passed on July 2. We, therefore, the Representatives of the united States of America, in General Congress, Assembled, appealing to the Supreme Judge of the world for the rectitude of our intentions, do, in the Name, and by Authority of the good People of these Colonies, solemnly publish and declare, That these united Colonies are, and of Right ought to be Free and Independent States; that they are Absolved from all Allegiance to the British Crown, and that all political connection between them and the State of Great Britain, is and ought to be totally dissolved; and that as Free and Independent States, they have full Power to levy War, conclude Peace, contract Alliances, establish Commerce, and to do all other Acts and Things which Independent States may of right do. And for the support of this Declaration, with a firm reliance on the protection of divine Providence, we mutually pledge to each other our Lives, our Fortunes and our sacred Honor.
Document 14: American Civil War: The American Civil War (commonly known as the Civil War in the United States) was fought in the United States from 1861 to 1865. The result of a long - standing controversy over slavery, war broke out in April 1861, when Confederates attacked Fort Sumter in South Carolina, shortly after President Abraham Lincoln was inaugurated. The nationalists of the Union proclaimed loyalty to the U.S. Constitution. They faced secessionists of the Confederate States of America, who advocated for states' rights to travel with slave attendants in the Americas or abolished tariffs on cotton and imports.
Document 15: United States Declaration of Independence: The Declaration of Independence is the statement adopted by the Second Continental Congress meeting at the Pennsylvania State House (Independence Hall) in Philadelphia on July 4, 1776, which announced that the thirteen American colonies, then at war with the Kingdom of Great Britain, regarded themselves as thirteen independent sovereign states, no longer under British rule. These states would found a new nation -- the United States of America. John Adams was a leader in pushing for independence, which was passed on July 2 with no opposing vote cast. A committee of five had already drafted the formal declaration, to be ready when Congress voted on independence.
ground_truth: American Civil War
sub_queries: who wrote four score and seven years ago Answer: Lincoln
Lincoln >> main subject Answer: American Civil War