Missouri Compromise
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40 free Missouri Compromise trivia questions with answers — history quiz, new questions added Oct 2026.
In 1819 a routine request for statehood turned into the first great fight over slavery in the American West. The bargain that ended it held for a generation, and when it broke, the country was on the road to civil war. This quiz covers the whole story: the proposal that started the crisis, the balance between free and slave states, the dividing line and the land it covered, the people who brokered the deal, and the later law and court ruling that tore it up. It suits AP US History students revising the antebellum period, teachers who want a multiple-choice warm-up, and anyone curious about how the United States argued its way toward 1861. Every answer comes with a short explanation.
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Q 01Which state's panhandle exists because Texas gave up its land north of the Missouri Compromise line?
Oklahoma
Oklahoma gained its panhandle from a strip nobody governed. Texas, a slave state, ceded its claims above the line, and the leftover land sat for decades as No Man's Land.
Q 02Which free state joined the Union alongside slaveholding Missouri under the Missouri Compromise?
Maine
Maine had been a district of Massachusetts until then. Southern lawmakers tied its statehood bill to Missouri's, so the free states could not gain a state without giving one.
Q 03The Missouri Compromise banned slavery in western territories above which line of latitude?
36°30′ north
36°30′ north also marked Missouri's own southern border, so the new slave state sat above the line as its single exception.
Q 04Which House Speaker became the Great Compromiser after steering the Missouri bills through Congress?
Henry Clay
Henry Clay broke the deadlock by dividing the combined package into separate bills, so that each half could pass the House with a different majority.
Q 05Which former president wrote that the Missouri crisis woke him like a fire bell in the night?
Thomas Jefferson
Thomas Jefferson, long retired, called the new dividing line the knell of the Union. He feared a border drawn on a moral principle would only cut deeper with time.
Q 06Which 1854 law repealed the Missouri Compromise by opening land above its line to slavery?
Kansas–Nebraska Act
The Kansas–Nebraska Act set off years of armed clashes between proslavery and antislavery settlers racing to control the newly opened land.
Q 07Which 1857 Supreme Court ruling declared the already repealed Missouri Compromise unconstitutional?
Dred Scott v. Sandford
Dred Scott v. Sandford held that Congress never had the power to bar slavery from the territories. The plaintiff had claimed freedom after living on free soil north of the line.
Q 08Which crop, rather than cotton, did planters expect enslaved workers to grow in early Missouri?
Hemp
Hemp suited the lower Missouri River valley, which had no prospects for cotton. Its promise drew slaveholders west, and the enslaved population more than tripled in a decade.
Q 09Which Illinois lawyer re-entered politics in 1854 to attack the repeal of the Missouri Compromise?
Abraham Lincoln
Abraham Lincoln spoke for three hours on the courthouse lawn, laying out moral, legal and economic arguments against slavery that set the stage for his later career.
Q 10Which president, the last of the Virginia dynasty, signed the Missouri Compromise into law in 1820?
James Monroe
James Monroe had endorsed the Southern tactic of holding a free state's admission hostage until Missouri could enter with slavery intact.
Q 11The Missouri Compromise line divided only the unorganized remainder of which vast land acquisition?
Louisiana Purchase
The Louisiana Purchase was the only land the line covered, which is why the slavery question reopened when the United States won new territory from Mexico.
Q 12Missouri became the first state located entirely west of which waterway when it joined the Union in 1821?
Mississippi River
The Mississippi River was where the old free-slave boundary, the Ohio River, ran out, so Missouri forced Congress to decide what rule applied beyond it.
Q 13Anger at the 1854 repeal of the Missouri Compromise led antislavery activists to found which political organization?
Republican Party
Q 21Which insult did John Randolph coin for Northerners who voted with the South in the Missouri debates?
Doughfaces
Doughfaces may be a mishearing. The Virginian was a keen hunter who sometimes brought his dog to Congress, and he may have been comparing the men to the timid face of a doe.
Q 22Which nickname is given to the corner of Missouri that dips south of the Missouri Compromise line?
The Bootheel
The Bootheel would have been cut off by the straight border first proposed. A local planter is said to have lobbied to keep his land in Missouri, and the boundary there was moved south.
Q 23Which colonial surveyors' boundary became shorthand for the slave–free divide during the Missouri debates?
Mason–Dixon line
The Republican Party rapidly gained support across the North, drawing in former Whigs and Free Soilers. Six years after the repeal it won the presidency.
Q 14Which Illinois Democrat, nicknamed the Little Giant, wrote the law that repealed the Missouri Compromise?
Stephen A. Douglas
Stephen A. Douglas only reluctantly agreed to the formal repeal, to win Southern support. Years earlier he had favoured stretching the old line across every US territory.
Q 15The 1854 law that replaced the Missouri Compromise let settlers decide on slavery under which principle?
Popular sovereignty
Popular sovereignty sounded neutral, but it turned a new territory into a contest. Thousands of armed men crossed over from Missouri to swing the vote for its first legislature.
Q 16Which slave state's admission in December 1819 left the Union evenly split as the Missouri debate resumed?
Alabama
Alabama made it eleven free states and eleven slave states. With the two sides level, one more slave state would have tipped the balance of power in Washington.
Q 17Which New York congressman set off the Missouri crisis in 1819 with an amendment to restrict slavery there?
James Tallmadge
James Tallmadge had already helped speed the end of slavery in his home state. He fell ill after proposing the amendment, and a colleague had to carry on the fight.
Q 18Admitting Missouri without a free partner would have handed slave states a majority in which body?
The Senate
The Senate gave every state two seats whatever its population, so it was the one place the South could match the faster-growing North. Paired admissions had kept it level since 1815.
Q 19Northern critics in the Missouri debates attacked which constitutional rule that inflated Southern House seats?
Three-Fifths Clause
The Three-Fifths Clause counted most of the enslaved population toward a state's seats and electoral votes. Northerners had no plan to repeal it, only to stop it spreading west.
Q 20Antislavery lawmakers in the Missouri debates cited which earlier law barring slavery north of the Ohio River?
Northwest Ordinance
The Northwest Ordinance had kept Indiana and Illinois free, which antislavery members offered as proof that Congress could set terms for new states. Southerners replied that it predated the Constitution.
The Mason–Dixon line was surveyed in the 1760s to end a border feud between Pennsylvania and Maryland. Decades later, Congress turned its name into a symbol of North against South.
Q 24Which Chief Justice wrote the 1857 opinion that declared the Missouri Compromise unconstitutional?
Roger B. Taney
Roger B. Taney had freed the slaves he inherited from his father, yet he sought to use this ruling to end the national debate over slavery for good.
Q 25Which president signed the 1854 repeal of the Missouri Compromise and was then denied renomination by his party?
Franklin Pierce
Franklin Pierce was a New Hampshire Democrat, so his support for opening the West to slavery cost him the North while many white Southerners still backed him.
Q 26In an 1820 letter on the Missouri crisis, a retired president likened slavery to holding which animal by the ear?
Wolf
Wolf was his image for a danger the country could neither keep hold of nor safely let go. He may have borrowed the phrase from the Roman biographer Suetonius.
Q 27The free state paired with Missouri in 1820 sought statehood after being left undefended in which conflict?
War of 1812
The War of 1812 left the district exposed to British invasion with little protection from its parent state. Resentment fed the drive to break away.
Q 28The 1857 ruling against the Missouri Compromise said its slavery ban breached which part of the Bill of Rights?
Fifth Amendment
The Fifth Amendment bars taking property without due process of law. The Court counted enslaved people as property, so a ban on holding them in the territories became an unlawful seizure.
Q 29Which Illinois senator proposed the dividing line that became the heart of the Missouri Compromise?
Jesse B. Thomas
Jesse B. Thomas offered the North a ban on slavery across the remaining territory in exchange for Missouri. He had earlier presided over the convention that wrote his own state's first constitution.
Q 30Which New York senator, the last Federalist nominee for president, led the push to restrict slavery in Missouri?
Rufus King
Rufus King gave what is considered the greatest speech of his career against admitting Missouri with slavery. Southerners suspected him of plotting to build a new Northern party.