AMSCO 5.8 Military Conflict in the Civil War

Overview

AMSCO Topic 5.8, Military Conflict in the Civil War, covers the fighting itself: why the Union won and the Confederacy lost between 1861 and 1865. The chapter walks through each side's strengths and weaknesses, the early Confederate victories in the East, the failure of "King Cotton" diplomacy, the 1863 turning points at Gettysburg and Vicksburg, and Grant and Sherman's total war strategy that ended with Lee's surrender at Appomattox. The Civil War killed about 750,000 people, freed 4 million enslaved African Americans, and transformed the country so deeply that some historians call it a Second American Revolution.

For the AP exam, the core skill here is explaining the factors behind Union victory: greater resources, improved leadership and strategy, key battlefield wins, and the destruction of the South's infrastructure.

Union vs. Confederate Strengths and Weaknesses

The Union held nearly every long-term advantage, but the Confederacy had real short-term strengths that made the war last four years.

Confederate advantages:

• Only had to fight a defensive war. The Union had to conquer territory the size of Western Europe.
• Shorter supply lines, a long indented coastline that was hard to blockade, experienced military leaders, and high troop morale.

Union advantages:

• Population of 22 million vs. 5.5 million free Whites in the Confederacy, boosted by 800,000 immigrants and 180,000 African American soldiers after emancipation. That math wins a war of attrition.
• Economic dominance: most of the banking and capital, 85% of factories, 70% of railroads, and 65% of farmland.
• A loyal U.S. Navy that eventually controlled the rivers and coastal waters.
• An established central government, while the Confederacy's commitment to states' rights undermined its own war effort.

Confederate hopes: European demand for cotton would bring foreign recognition and aid, and Northerners would eventually decide the war wasn't worth the cost and quit. Neither happened.

Problems Inside the Confederacy

The Confederate constitution copied the U.S. Constitution but denied its congress the power to levy protective tariffs or fund internal improvements (it did ban the foreign slave trade). States' rights crippled the war effort. Southern governors resisted President Jefferson Davis's attempts to expand executive power, some even withholding troops and supplies. Vice President Alexander H. Stephens went so far as to urge Georgia to secede from the Confederacy over its "despotic" central government.

Money was a constant crisis. Loans, income taxes, and impressment of private property couldn't cover war costs, so the government printed over $1 billion in paper money. By the war's end, a Confederate dollar was worth less than two cents.

The Early War, 1861-1862

Everyone expected a short war (Lincoln's first volunteers signed up for just 90 days). Instead, the Union spent two years losing in the East while quietly winning at sea and in the West.

Union Strategy: The Anaconda Plan

General-in-Chief Winfield Scott designed a three-part strategy:

1. Use the navy to blockade Southern ports and choke off supplies (the Anaconda Plan)
2. Take control of the Mississippi River to split the Confederacy in two
3. Raise a 500,000-man army to capture Richmond

The first two proved easier than the third, but all three mattered in the end.

Defeats in the East

• First Battle of Bull Run (July 1861): 30,000 Union troops marched toward Manassas Junction, Virginia, and seemed close to victory until reinforcements under Thomas "Stonewall" Jackson counterattacked and sent them fleeing back to Washington. The battle killed the illusion of a short war and fed the myth that the rebels were unbeatable.
• Peninsula Campaign (1862): General George B. McClellan trained his army endlessly, finally invaded Virginia in March 1862, and was stopped by Robert E. Lee's brilliant tactics. After five months, McClellan retreated and was replaced by John Pope.
• Second Battle of Bull Run: Lee trapped Pope's army, hit its flank, and drove the Union back to Bull Run again.
• Antietam (September 1862): Lee invaded Maryland, hoping a victory on Union soil would win British recognition. McClellan (restored to command) got lucky: a copy of Lee's battle plan was accidentally dropped by a Confederate officer. The armies met at Antietam Creek near Sharpsburg, Maryland, in the bloodiest single day of the war, with over 22,000 killed or wounded. Tactically a draw, but Lee retreated, Britain and France withheld recognition, and Lincoln got enough of a "victory" to announce the Emancipation Proclamation (covered in Topic 5.9). Lincoln then fired McClellan for the final time for failing to chase Lee.
• Fredericksburg (December 1862): McClellan's replacement, the aggressive Ambrose Burnside, attacked Lee's entrenched army and lost 12,000 dead or wounded to the Confederates' 5,000. Generals on both sides were slow to realize that improved weaponry made heroic charges against entrenched positions suicidal.

Bright Spots: Ironclads and Grant in the West

• Monitor vs. Merrimac (March 9, 1862): The Confederate ironclad Merrimac sank several wooden Union ships near Hampton Roads, Virginia, threatening the blockade. The Union's own ironclad, the Monitor, fought it to a five-hour draw, saving the Anaconda Plan. The duel marked a turning point in naval warfare as ironclads replaced wooden ships.
• Forts Henry and Donelson (early 1862): Ulysses S. Grant combined gunboats and army maneuvers to capture both forts on the Cumberland River, taking 14,000 Confederate prisoners and opening Mississippi to attack.
• Shiloh (Tennessee): Albert Johnston's Confederates surprised Grant, but the Union forced a Confederate retreat after more than 23,000 dead and wounded on both sides.
• New Orleans (April 1862): Union navy under David Farragut captured the South's biggest port.

Foreign Affairs and Cotton Diplomacy

The Confederacy's best hope was foreign intervention, and it never came. Confederate leaders bet that "King Cotton" would force Britain or France to help, since British textile mills needed Southern cotton and British aristocrats wouldn't mind seeing American democracy fail.

• Trent Affair (late 1861): A Union warship stopped the British steamer Trent and seized Confederate diplomats James Mason and John Slidell. Britain threatened war until Lincoln released them. Mason and Slidell never won recognition from Britain or France.
• Confederate raiders: Britain let the Confederacy buy warships from British shipyards. One raider, the Alabama, captured more than 60 U.S. merchant vessels before a Union warship sank it off France. After the war, Britain paid the U.S. $15.5 million in damages.
• Why cotton diplomacy failed: Europe found cotton elsewhere (Egypt and India) and shifted to wool and linen. Lee's setback at Antietam meant Britain wouldn't gamble on recognition without a decisive Confederate win. And the Emancipation Proclamation (January 1863) made ending slavery a Union war aim, which won over Britain's antislavery working class. British leaders couldn't defy that public opinion.

The Union Triumphs, 1863-1865

July 1863 was the turning point. Lee won at Chancellorsville early in the year, but the Confederate economy was collapsing, planters were losing control of enslaved laborers, and starving soldiers were deserting.

Vicksburg and Gettysburg

• Vicksburg (surrendered July 4, 1863): Grant besieged and bombarded the fortified Mississippi city for seven weeks until it surrendered along with nearly 29,000 soldiers. The Union now controlled the entire Mississippi River, cutting Texas, Louisiana, and Arkansas off from the rest of the Confederacy. Scott's second strategic goal, achieved.
• Gettysburg (July 1-3, 1863): Lee invaded Pennsylvania hoping to destroy the Union army or capture a Northern city and force peace talks. The result was the war's most crucial and bloodiest battle, with more than 50,000 casualties. Lee's assaults on Union lines, including George Pickett's famous failed charge, destroyed part of the Confederate army. Lee retreated to Virginia and never regained the offensive.

Grant's War of Attrition

In early 1864 Lincoln made Grant commander of all Union armies. Grant's strategy was attrition: wear down Confederate armies and destroy their supply lines. At the Wilderness, Spotsylvania, and Cold Harbor, Grant's Army of the Potomac took heavier casualties than Lee's forces but kept shrinking Lee's army and pinned it into a defensive line around Richmond. The war had shifted from a limited contest over territory to modern "total" war, where victory meant breaking civilian support for the enemy's military.

Sherman's March

William Tecumseh Sherman, leading 100,000 men, was Grant's chief instrument of total war. Marching from Chattanooga across Georgia, his troops burned cotton fields, barns, and houses, destroying anything the enemy could use to survive. He took Atlanta in September 1864 (just in time to help Lincoln's reelection), reached Savannah in December, and burned Columbia, South Carolina, the "cradle of secession," in February 1865. The march did exactly what it was designed to do: break the Confederacy's will to fight.

The End of the War

The blockade plus Sherman's destruction spread hunger across the South in the winter of 1864-1865. Grant kept outflanking Lee's lines until they collapsed around Petersburg, and Richmond fell on April 3, 1865.

Peace negotiations went nowhere because Lincoln would accept nothing short of restoring the Union, and Jefferson Davis demanded nothing less than independence. Lee retreated from Richmond with fewer than 30,000 men, tried to escape to the mountains, and was cut off. He surrendered to Grant at Appomattox Court House, Virginia, on April 9, 1865. Grant treated Lee with respect and let his men go home with their horses.

The chapter ends with open questions that set up Reconstruction: what would freedom mean for nearly 4 million formerly enslaved people, and what would happen to American democracy?

Key Terms to Know

Practice and Next Steps

Pair these notes with the Topic 5.8 course study guide, which frames the same content around the exam skill of explaining Union victory. The home-front side of the war (draft riots, Emancipation Proclamation, wartime economy) is in AMSCO 5.9, and the lead-up to secession is in AMSCO 5.7. Browse the full set of APUSH AMSCO notes for the rest of Unit 5.

To check your understanding, run through guided multiple-choice practice, then try writing about Union victory factors with FRQ practice and instant scoring. When you're closer to test day, take a full-length APUSH practice exam.