Final answer:
Grant proposed to the Confederates that any proposition for peace, union integrity, and slavery abolition would be considered and met with liberal terms, which eventually led to Lee's surrender.
Step-by-step explanation:
Ulysses S. Grant suggested to the Confederate peace delegation that any proposition aiming for the restoration of peace, the integrity of the entire Union, and the abandonment of slavery would be received and considered by the Executive government of the United States.
These terms would be met with liberal terms on other major and incidental points if they came from an authority able to control the Confederate armies. In direct communications, Grant wrote to General Lee on April 7 indicating that continued conflict would be pointless and urged Lee to surrender.
An exchange of letters followed, leading to the surrender of the Army of Northern Virginia at the McLean house in Appomattox Courthouse, Virginia, on April 9.