"All persons," Lincoln wrote, "held as slaves within any State in rebellion shall be then, thenceforward, and forever free." What change in Lincoln’s goal for the Civil War is being made in this quote?

Lincoln never wanted to end slavery (and he never did), but in this quote you can see him shifting from believing "Let's just get the country back together" to "Let's actually change somethings"

Explanation:

The setting itself reflected how much had changed in the past four years. ... not Southern slavery in the passage above: his point being that the nation as a ... all would agree to forget “whatever they may heretofore have thought, said or done .

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