This unit follows the United States from the sectional crisis of the 1850s through the Civil War (1861-1865) and the Reconstruction era that ended in 1877. By the end, you should be able to explain why the war happened, how the Union won it, what emancipation changed, and why the promises of Reconstruction were only partly kept.
Read the overview first, then work through each topic's notes and checkpoint question before testing yourself on the common mistakes and key terms.
Unit 7 covers roughly 1850 to 1877, the most violent and constitutionally important stretch in US history. The topics move in order from causes, to the war itself, to emancipation, to the rebuilding of the nation afterward.
Honors US History Unit 7 covers the Civil War and Reconstruction. You study the sectional conflicts of the 1850s (the Compromise of 1850, the Kansas-Nebraska Act, Dred Scott v. Sandford, John Brown's raid) and how Lincoln's 1860 election led to secession and the firing on Fort Sumter in April 1861. You then follow the war's strategies and turning points, especially Antietam, Gettysburg, Vicksburg, and Sherman's campaigns, through Lee's surrender at Appomattox in April 1865. The unit closes with the Emancipation Proclamation, the 13th, 14th, and 15th Amendments, the clash between Andrew Johnson and Congress over Reconstruction, and the Compromise of 1877 that marked the end of Reconstruction. Expect primary-source work such as the Cornerstone Speech, the Gettysburg Address, and the Black Codes, plus argumentative essays about causes and consequences.
Economic differences and arguments about states' rights mattered, but they were almost always arguments about slavery. Crises such as Bleeding Kansas and Dred Scott turned on whether slavery could spread into new territories. Other conflicts concerned slavery in states where it already existed. Several seceding states named slavery directly in declarations explaining their decisions.
The North had about 22 million people to the South's 9 million (including about 3.5 million enslaved people) and most of the nation's factories and railroads. Early Confederate victories showed the war would not be quick. Victories at Vicksburg and Gettysburg in July 1863, followed by Grant's and Sherman's coordinated campaigns in 1864, wore the Confederacy down until Lee surrendered in April 1865.
The 13th Amendment abolished slavery and involuntary servitude except as punishment for a crime. The 14th defined national citizenship, and the 15th barred racial discrimination in voting. Black Southerners voted, held office, and built schools and churches. Klan violence, Supreme Court rulings, and Northern fatigue let white Southern Democrats retake power, and federal support for Reconstruction governments ended in 1877.
Union victory preserved the Union, and the 13th Amendment abolished slavery and involuntary servitude except as punishment for a crime. The harder question was whether formerly enslaved people would have real political and economic freedom, and the nation backed away from that commitment by 1877. That unfinished business is why historians often connect Reconstruction directly to the civil rights movement of the 1950s and 1960s.
The Civil War grew out of a long dispute over whether slavery would expand into western territories.
The two sides needed different things to win.
Lincoln began the war focused on saving the Union, not ending slavery.
Reconstruction (1865-1877) tried to answer two questions.
The Civil War grew out of a long dispute over whether slavery would expand into western territories. The Missouri Compromise of 1820 admitted Missouri as a slave state but banned slavery north of 36°30' in the remaining Louisiana Purchase territory.
The 1850s broke that balance. The Compromise of 1850 included a tougher Fugitive Slave Act that allowed federal officials to compel people to help capture alleged fugitives. The law turned many Northerners against slavery. The Kansas-Nebraska Act (1854) repealed the Missouri line and let settlers vote on slavery through popular sovereignty, leading to the violence of Bleeding Kansas. In Dred Scott v. Sandford (1857), Chief Justice Roger Taney ruled that Black Americans could not be citizens and that Congress could not ban slavery in the territories. John Brown's 1859 raid on Harpers Ferry convinced many white Southerners that the North wanted slavery destroyed by force.
Lincoln won the 1860 election with about 40 percent of the popular vote and no Southern electoral votes. South Carolina seceded in December 1860, and six more Deep South states followed by February 1861 to form the Confederacy. Confederate forces fired on Fort Sumter on April 12, 1861. When Lincoln called for 75,000 volunteers, Virginia, Arkansas, North Carolina, and Tennessee also seceded.
The Confederates were clear about their motives. Vice President Alexander Stephens's 1861 Cornerstone Speech called slavery the foundation of the new government.
Why did four states, including Virginia, wait until after Fort Sumter to secede? (Answer: They hoped to avoid war, but when Lincoln called for troops to put down the rebellion, they refused to send soldiers against other slave states and joined the Confederacy.)
| Event | Year | What it did | Why it raised tension |
|---|---|---|---|
| Compromise of 1850 | 1850 | Admitted California as free and passed a stricter Fugitive Slave Act | Federal officials could compel people to help capture alleged fugitives |
| Kansas-Nebraska Act | 1854 | Repealed the Missouri Compromise line and allowed popular sovereignty | Led to violence in Kansas and the founding of the Republican Party |
| Dred Scott v. Sandford | 1857 | Denied Black citizenship and blocked congressional bans on slavery in territories | Made the Republican platform of stopping slavery's spread seem unconstitutional |
| John Brown's raid | 1859 | Tried to seize federal weapons at Harpers Ferry to arm enslaved people | Many Southerners saw Northern sympathy for Brown as a threat to their safety |
The two sides needed different things to win. The Union had to defeat the Confederacy and restore control, so it adopted the Anaconda Plan to blockade Southern ports, take the Mississippi River, and squeeze the South. The Confederacy only had to survive until the North gave up or Britain or France stepped in.
The First Battle of Bull Run (July 1861) was a Confederate win that ended Northern hopes of a short war. Antietam (September 17, 1862) was the bloodiest single day in American history, with about 23,000 casualties. It was a tactical draw, but Lee retreated to Virginia, which gave Lincoln the opening to announce emancipation.
July 1863 was the turning point. At Gettysburg (July 1-3), the Union repelled Lee's second invasion of the North, and Pickett's Charge on the third day failed with heavy losses. Vicksburg surrendered to Grant on July 4. Port Hudson surrendered on July 9, giving the Union control of the Mississippi and cutting the Confederacy in two.
In 1864, Grant became general-in-chief and pressed Lee in Virginia while Sherman took Atlanta in September, a win that helped Lincoln win reelection. Sherman's March to the Sea (November-December 1864) used total war to wreck the South's resources. Lee surrendered at Appomattox Court House on April 9, 1865, and Lincoln was assassinated five days later. Between 620,000 and 750,000 soldiers died in the war.
Why does Vicksburg count as a turning point even though it was a siege rather than a dramatic charge? (Answer: Its capture, followed by the surrender of Port Hudson, gave the Union control of the Mississippi River. That completed part of the Anaconda Plan and separated Texas, Arkansas, and most of Louisiana from the rest of the Confederacy.)
Lincoln began the war focused on saving the Union, not ending slavery. He worried that early emancipation would push the four slaveholding border states (Kentucky, Missouri, Maryland, and Delaware) into the Confederacy.
By summer 1862, enslaved people escaping to Union lines and pressure from abolitionists and Radical Republicans had changed the situation. Lincoln drafted a proclamation in July but waited for a victory so it would not look desperate. After Antietam, he issued the preliminary proclamation on September 22, 1862, and the final version took effect on January 1, 1863.
Lincoln justified it as a war measure under his power as commander in chief. That is why it only applied to areas in active rebellion. It did not free anyone in the border states or in Union-held areas such as Tennessee. In the short run it freed few people directly, but every Union advance after 1863 became a march toward freedom.
Its effects were large. It authorized the recruitment of Black men into federal service. About 180,000 served in the Union Army and about 20,000 in the Navy. Black soldiers had also enlisted before the proclamation, and the 54th Massachusetts fought at Fort Wagner in 1863. The proclamation made British or French recognition of the Confederacy less likely. Because a wartime order could be challenged after the war, Lincoln pushed for the 13th Amendment, which Congress passed in January 1865 and the states ratified in December 1865.
Why did the Emancipation Proclamation leave slavery legal in Kentucky? (Answer: Lincoln justified the proclamation as a war measure and limited it to areas in rebellion. Kentucky was a loyal border state that he wanted to keep in the Union.)
Reconstruction (1865-1877) tried to answer two questions. How would Confederate states rejoin the Union, and what rights would four million freed people have?
Andrew Johnson, who became president after Lincoln's assassination, pardoned many former Confederates and let Southern states rebuild quickly. Those states passed Black Codes that limited where Black people could live and work and forced them into labor contracts. Radical Republicans in Congress, led by figures such as Thaddeus Stevens, took control. They passed the Civil Rights Act of 1866 over Johnson's veto, and the Reconstruction Acts of 1867 divided the South into five military districts. The House impeached Johnson in 1868, and the Senate acquitted him by one vote.
For a few years, Black Southerners voted and held office. Hiram Revels of Mississippi became the first Black US senator in 1870. The Freedmen's Bureau set up more than 1,000 schools. Many freed families without land became sharecroppers, trading a share of their crop for land to farm and often falling into debt.
The Ku Klux Klan and similar groups used terror to stop Black political activity. Supreme Court decisions like the Slaughterhouse Cases (1873) narrowed the 14th Amendment, and the Panic of 1873 turned Northern attention elsewhere. After Republican Rutherford B. Hayes won the disputed election, he withdrew federal troops supporting the remaining Reconstruction governments in Louisiana and South Carolina. These withdrawals marked the end of Reconstruction. Literacy tests, poll taxes, and grandfather clauses spread in the following decades and kept most Black Southerners from voting until the 1960s.
Why did Congress pass the 14th Amendment in 1866, one year after passing the 13th? (Answer: The 13th abolished slavery and involuntary servitude except as punishment for a crime, but it did not define citizenship. Southern states passed Black Codes restricting freed people, and the 14th Amendment responded by defining citizenship and guaranteeing equal protection of the laws.)
| Amendment | Ratified | What it says | How it was undermined |
|---|---|---|---|
| 13th | 1865 | Abolished slavery and involuntary servitude, except as punishment for a crime | The crime exception allowed convict leasing, and Black Codes recreated forced labor |
| 14th | 1868 | Defined citizenship for people born or naturalized in the US and subject to its jurisdiction, and guaranteed equal protection and due process | The Supreme Court read it narrowly in the Slaughterhouse Cases (1873) and later Plessy v. Ferguson (1896) |
| 15th | 1870 | Banned denying the vote based on race, color, or previous condition of servitude | Klan violence, then literacy tests, poll taxes, and grandfather clauses after Reconstruction |
| Term | Definition |
|---|---|
| Missouri Compromise (1820) | The agreement that admitted Missouri as a slave state and banned slavery north of 36°30' in the remaining Louisiana Purchase territory. The Kansas-Nebraska Act later repealed the restriction. |
| Fugitive Slave Act (1850) | A law that strengthened federal enforcement of fugitive slave claims and allowed officials to compel people to help capture alleged fugitives. It denied those accused of escaping slavery a jury trial. |
| Bleeding Kansas | The violence between proslavery and antislavery settlers in Kansas Territory after the Kansas-Nebraska Act of 1854. |
| Confederate States of America | The government formed by eleven seceding Southern states in 1861, with Jefferson Davis as president. |
| Gettysburg Address | Lincoln's November 1863 speech that redefined the war as a test of whether a nation based on equality could survive. |
| Freedmen's Bureau | A federal agency created in 1865 that gave freed people food, medical care, legal help, and schools until it closed in 1872. |
| Reconstruction Acts (1867) | Laws that placed ten former Confederate states under military rule and required them to ratify the 14th Amendment and allow Black male suffrage to rejoin the Union. Tennessee had already been readmitted and was excluded. |
| Ku Klux Klan | A white supremacist group founded in 1866 that used terror against Black Southerners and white Republicans to overturn Reconstruction. |
| Equal protection clause | The part of the 14th Amendment that forbids states from denying any person equal protection of the laws. |
The states' rights explanation became popular after the war, so you may have heard it often. Ask which right the states were defending. Secession declarations and the Cornerstone Speech name slavery directly, and Southern leaders supported strong federal power when it helped slavery, as with the Fugitive Slave Act.
It only applied to areas in rebellion, so it left slavery legal in the border states and Union-occupied areas. Freedom spread as Union armies advanced and as enslaved people escaped to them. The 13th Amendment abolished slavery and involuntary servitude throughout the US in December 1865, except as punishment for a crime.
Gettysburg gets more attention because of Pickett's Charge and Lincoln's address, but Vicksburg surrendered the next day and arguably mattered as much. A strong answer pairs them: Gettysburg ended Lee's invasions of the North, and Vicksburg and the subsequent surrender of Port Hudson gave the Union control of the Mississippi and split the Confederacy.
Reconstruction produced real gains, including Black voting, Black officeholders, public schools, and three amendments. Federal support for Reconstruction weakened in the face of organized violence, narrow court rulings, and declining Northern commitment. In 1877, federal support for the remaining Reconstruction governments ended. The Compromise of 1877 was a political choice, not a natural endpoint.