Websites
Original Doc
Straight from the source.
Articles
The History Channel's Take
A quick and dirty overview of the causes and results of the Compromise.
Slavery in America
Basically, everything was horrible.
Smithsonian Map of Slavery's Expansion
An interesting exploration of how slavery came to consume nearly half of the U.S.
Video
Khan Academy's Missouri Compromise Video
How did the Missouri Compromise lead to the Civil War? Um, in a big way.
Tom Richey's Overview of the Missouri Compromise
One AP U.S. History teacher's overview of the Missouri Compromise. Mr. Richey seems like a nice guy.