Based on the passage, why was Grant promoted to Commanding General of
the United States Army?

Explanation:

Grant's commission to command the U.S. Army. On March 10, 1864, President Abraham Lincoln signs a brief document officially promoting then-Major General Ulysses S. Grant to the rank of lieutenant general of the U.S. Army, tasking the future president with the job of leading all Union troops against the Confederate Army

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