1.
13th Amendment: An amendment passed in 1865 that abolished slavery.
2.
Abraham Lincoln: 
President of the United States of America during the Civil War.
3.
Anaconda Plan: 
The three-part strategy by which the Union proposed to defeat the Confederacy in the Civil War.
4.
border states: Slave states that remained in the Union (Missouri, Kentucky, Maryland, and Delaware).
5.
Clara Barton: 
Union nurse during the Civil War, known as an "angel of the battlefield;" founded the American Red Cross in 1881.
6.
conscription: The drafting of civilians to serve in the army.
7.
Copperheads: Group of Northern Democrats who opposed the Civil War and sympathized with the South.
8.
David Farragut: 
Union naval admiral whose fleet captured New Orleans and Baton Rouge.
9.
Emancipation Proclamation: An executive order issued by Abraham Lincoln on January 1, 1863, freeing the slaves in all regions controlled by the Confederacy.
10.
George McClellan: 
Top Union general at the beginning of the war. An over-cautious general, he was fired by President Lincoln for failure to press Lee's Confederate troops in Richmond.
11.
Gettysburg Address: A speech given by Abraham Lincoln on November 19, 1863 stating that the purpose of the Civil War was to protect liberty, equality, and democratic ideas.
12.
habeas corpus: The right not to be held in prison without first being charged with a specific crime.
13.
Income Tax: Tax that takes a percentage of an individual's salary (income).
14.
Jefferson Davis: 
President of the Confederate States of America during the Civil War.
15.
John Wilkes Booth: 
An American stage actor and Confederate sympathizer who assassinated Abraham Lincoln on April 14, 1865.
16.
Red Cross: Relief agency founded by Clara Barton in 1881.
17.
Robert E. Lee: 
Top general in the Confederacy. A former Union officer that was offered command of the Union Army, later joined the South after his native Virginia seceded.
18.
Stonewall Jackson: 
Confederate general, known as General Lee's "right hand man;" killed by friendly fire at the Battle of Chancellorsville.
19.
Ulysses S. Grant: 
Successful Union general who won battles in the Western Theater before being promoted as the top commander of the Union Army.
20.
William T. Sherman: 
A successful Union general who implemented the tactic of "total war" in order to defeat the South. Led successful military campaign to conquer Georgia, South Carolina, and North Carolina.