How is the house divided speech primary?

The "House Divided" speech, delivered by Abraham Lincoln in 1858, is primary because it presents Lincoln's own Words and thoughts during a pivotal time in American history. It reflects his views on slavery and the moral and political divisions in the nation, emphasizing that the country could not endure permanently half slave and half free. This speech is a direct primary source that offers insight into Lincoln's beliefs and the context of the era leading up to the Civil War.