Lincoln's leadership in ending slavery in the country was a historic development that elevated the action portrayed in "Lincoln's Last Warning."
We can arrive at this answer because:
Lincon's leadership and determination to end slavery is what spurred the artist to draw "Lincoln's Last Warning." In this image, Lincoln shows the southern states that slavery will be ended and they must abandon it as soon as possible.
You can see "Lincoln's Last Warning" in the attached image.
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