What was the "healing act" that MOST likely inspired "The Blue and the Gray"?

It was the act of compassion and reconciliation by the ladies of Columbus, Mississippi, that received extensive national praise and inspired the poem "The Blue and the Gray." Their deed of compassion was covered as an act of national reconciliation by newspapers across the country.

He issued the emancipation proclamation. it started changing slavery, and eventually lead to the freedom of slaves.

The market had lost much of its value.