Answer :
Answer: Lincoln's issue of the Emancipation Proclamation (January 1, 1863) caused Frederick Douglass to change his opinion of Lincoln.
Explanation:
On January 1, 1863, during the third year of the civil war, Lincoln issued the Emancipation Proclamation. It stated that "all persons held as slaves are, and henceforward shall be free." This was a turning point for Douglass-Lincoln relationship, as Douglass realized that Lincoln was no longer focused on the Union - instead, he wanted to end slavery. Douglass did believe that this decision was long overdue, but genuinely supported Lincoln and his action.