House divided speech

Abraham Lincoln delivered his House Divided Speech at Springfield, Illinois, on this date in 1858.

“A house divided against itself cannot stand.”

I believe this government cannot endure, permanently half slave and half free.

I do not expect the Union to be dissolved — I do not expect the house to fall — but I do expect it will cease to be divided.

It will become all one thing or all the other.

Either the opponents of slavery, will arrest the further spread of it, and place it where the public mind shall rest in the belief that it is in the course of ultimate extinction; or its advocates will push it forward, till it shall become alike lawful in all the states, old as well as new — North as well as South.

The speech was made at the Illinois Republican State convention that had nominated Lincoln for U.S. Senator. It was a precursor to the Lincoln-Douglas debates during that campaign, which Lincoln lost. It seems to be about as succinct a statement of the core issue of the Civil War as one could find.