Because Sherman had proved himself a competent General who had given good service to Grant.
They were also good friends. In his memoirs, Sherman said "He stood by me when I was mad. And I stood by him when he was drunk."
Ulysses Sherman Grant died in 1932.
Ulysses Sherman Grant was born in 1867.
commander Grant because Grant was efficient.
He appointed Grant as General-in-Chief in March 1864.
Sherman
General Sherman wrote about his reasons of concern for his friend US Grant at the Siege of Vicksburg. Sherman believed that Grant was working and hampered by Northern public opinion. So much so that Sherman feared Grant would abandon the effort to capture Vicksburg.
General Grant
Ulysses S. Grant
Sherman carried credibility with Grant, tested under fire, and was a trusted friend.
To change the course of the war. Grant and Sherman both believed that it was the strength of the people's will that was keeping the war going.
Grant and Sherman
William Sherman