Question: Underground Airlines is a 2016 novel by Ben Winters that contains the unsuccussful proposal introducted by which United States Senator?

full_context: Document 1: Colson Whitehead: Colson Whitehead (born November 6, 1969) is an American novelist. He is the author of six novels, including his debut work, the 1999 novel "The Intuitionist", and "The Underground Railroad" (2016), for which he won the 2016 National Book Award for Fiction and the 2017 Pulitzer Prize for Fiction. He has also published two books of non-fiction. In 2002, he received a MacArthur Fellowship ("Genius Grant").
Document 2: Slave states and free states: In the history of the United States of America, a slave state was a U.S. state in which the practice of slavery was legal, and a free state was one in which slavery was prohibited or being legally phased out. Historically, all the British colonies had practiced slavery. The division between slave and free states began during the American Revolution (1775–1783). Slavery became a divisive issue and was the primary cause of the American Civil War. The Thirteenth Amendment to the United States Constitution, ratified in 1865, abolished slavery throughout the United States, and the distinction between free and slave states ended.
Document 3: Crittenden Compromise: The Crittenden Compromise was an unsuccessful proposal introduced by United States Senator John J. Crittenden (Constitutional Unionist of Kentucky) on December 18, 1860. It aimed to resolve the secession crisis of 1860–1861 by addressing the fears and grievances about slavery that led many slave-holding states to contemplate secession from the United States.
Document 4: 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 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 perpetual slavery and its expansion in the Americas.
Document 5: Corwin Amendment: The Corwin Amendment is a proposed amendment to the United States Constitution that would shield "domestic institutions" of the states (which in 1861 included slavery) from the constitutional amendment process and from abolition or interference by Congress. It was passed by the 36th Congress on March 2, 1861, and submitted to the state legislatures for ratification. Senator William H. Seward of New York introduced the amendment in the Senate and Representative Thomas Corwin of Ohio introduced it in the House of Representatives. Prior to the American Civil War, it was one of several measures considered by Congress in an ultimately unsuccessful attempt to attract the seceding states back into the Union and in an attempt to entice border slave states to stay.
Document 6: Missouri Compromise: The Missouri Compromise is the title generally attached to the legislation passed by the 16th United States Congress on May 8, 1820. The measures provided for the admission of Maine as a state along with Missouri as a slave state, thus maintaining the balance of power between North and South. As part of the compromise, slavery was prohibited North of the 36°30′ parallel, excluding Missouri. President James Monroe signed the legislation on April 6, 1820.
Document 7: Outline of the American Civil War: American Civil War – civil war in the United States of America that lasted from 1861 to 1865. Eleven Southern slave states declared their secession from the United States and formed the Confederate States of America, also known as "the Confederacy." Led by Jefferson Davis, the Confederacy fought against the United States (the Union), which was supported by all the free states (where slavery had been abolished) and by five slave states that became known as the border states.
Document 8: Underground Airlines: Underground Airlines is a 2016 novel by Ben Winters which is set in a contemporary alternate-history United States where the American Civil War never occurred because Abraham Lincoln was assassinated prior to his 1861 inauguration and a version of the Crittenden Compromise was adopted instead. As a result, slavery has remained legal in the "Hard Four" (a group of southern states which have kept slavery): Alabama, Louisiana, Mississippi and a unified Carolina. The novel attracted praise for exploring racism through the alternate-history mechanism, but also engendered criticism for coverage that seemingly ignored similar contributions by Octavia Butler.
Document 9: 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 "helped lay the groundwork for the Civil War", according to Will Kaufman.
Document 10: King Cotton: "King Cotton" as a slogan summarized the strategy used before the American Civil War of 1861–1865 by pro-secessionists in the Southern States (the future Confederacy) to claim the feasibility of secession and to prove there was no need to fear a war with the Northern States. The theory held that control over cotton exports would make a proposed independent Confederacy economically prosperous, would ruin the textile industry of New England, and—most importantly—would force Great Britain and perhaps France to support the Confederacy militarily because their industrial economies depended on Southern cotton. The slogan, widely believed throughout the South, helped in mobilizing support for secession: by February 1861, the seven states whose economies were based on cotton plantations had all seceded and formed the Confederacy (C.S.A.). Meanwhile, the other eight slave states, with little or no cotton production, remained in the Union.
Document 11: Compromise of 1850: The Compromise of 1850 was a package of five separate bills passed by the United States Congress in September 1850, which defused a four-year political confrontation between slave and free states on the status of territories acquired during the Mexican–American War (1846–1848). The compromise, drafted by Whig Senator Henry Clay of Kentucky and brokered by Clay and Democratic Senator Stephen Douglas of Illinois, reduced sectional conflict. Controversy arose over the Fugitive Slave provision. The Compromise was greeted with relief, but each side disliked some of its specific provisions:
Document 12: Cooperationists: The Cooperationists were a group formed in the United States in the 1860s. The group was formed after the Election of 1860. Following South Carolina's Secession from the Union, the Cooperationists believed that the remaining slave states should secede at once and at the same time, rather than one at a time, as they believed that doing so would impress the federal government with the seriousness of their resolve. The proposal was rejected, but the Southern States nonetheless seceded in rapid succession. The following is a list of the states that seceded, including the date on which each state seceded: South Carolina (December 20, 1860), Mississippi (January 9, 1861), Florida (January 10, 1861), Alabama (January 11, 1861), Georgia (January 19, 1861), Louisiana (January 26, 1861), Texas (February 1, 1861), Virginia (April 17, 1861), Arkansas (May 6, 1861), North Carolina (May 20, 1861), and Tennessee (June 8, 1861).
Document 13: Tariff of 1833: The Tariff of 1833 (also known as the Compromise Tariff of 1833, ch. 55, 4 Stat. 629 ), enacted on March 2, 1833, was proposed by Henry Clay and John C. Calhoun as a resolution to the Nullification Crisis. Enacted under Andrew Jackson's presidency, it was adopted to gradually reduce the rates following southerners' objections to the protectionism found in the Tariff of 1832 and the 1828 Tariff of Abominations; the tariffs had prompted South Carolina to threaten secession from the Union. This Act stipulated that import taxes would gradually be cut over the next decade until, by 1842, they matched the levels set in the Tariff of 1816—an average of 20%. The compromise reductions lasted only two months into their final stage before protectionism was reinstated by the Black Tariff of 1842.
Document 14: Border states (American Civil War): In the context of the American Civil War (1861–1865), the border states were slave states that did not declare a secession from the Union and did not join the Confederacy. To their north they bordered free states of the Union and to their south they bordered Confederate slave states. Of the 34 U.S. states in 1861, nineteen were free states and fifteen were slave states. Four slave states never declared a secession: Delaware, Kentucky, Maryland, and Missouri. Four others did not declare secession until after the Battle of Fort Sumter and were briefly considered to be border states: Arkansas, North Carolina, Tennessee, and Virginia—after this, they were less frequently called “border states”. Also included as a border state during the war is West Virginia, which was formed from 50 counties of Virginia and became a new state in the Union in 1863.
Document 15: Slavery by Another Name: Slavery by Another Name: The Re-Enslavement of Black Americans from the Civil War to World War II is a book by American writer Douglas A. Blackmon, published by Anchor Books in 2008. It explores the forced labor of imprisoned black men and women, through the convict lease system used by states, local governments, white farmers, and corporations after the American Civil War until World War II in the southern United States. Blackmon argues that slavery in the United States did not end with the Civil War, but instead persisted well into the 20th century. It depicts the subjugation of Convict Leasing, Sharecropping and Peonage and tells the fate of the former but not of the latter two.
ground_truth: John J. Crittenden