Why does Hannah Johnson say the Emancipation Proclamation “will make the Angels sing” Lincoln’s praises?

Hannah Johnson praises Lincoln because the Emancipation Proclamation corrects the injustice of slavery. Calling it something that will make the angels sing expresses joy that he has acted against a wicked wrong. The best answer is “because he has corrected something wicked,” rather than simply praising him as a good president or the proclamation as a good law.

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