We’re just getting to the Civil War period in the class that I am serving 
      as a TA. The professor I work for raised an interesting question diving 
      into the realm of counter factual history. What if Robert E. Lee had 
      accepted Lincoln’s offer and commanded Union forces? This automatically 
      raises the question about the outcome of the war. I argue that had Lee 
      taken the offer, the war would have been much shorter, and Grant would not 
      have had his meteoric rise. The Union would have one very quickly, if not 
      outright at Bull Run. Lee, as history has shown, was a skilled officer and 
      countless times demonstrated his ability to the chagrin of Union 
      commanders.
Let’s start in 1861. Lee has accepted command of Union 
      forces. He commands an army of 75,000 volunteers all in or near 
      Washington. I would say that Lee would have moved decisively against the 
      enemy. For the sake of this hypothetical story, I will let Bull Run occur 
      the way it actually happened. The Peninsula Campaign would have actually 
      succeeded, as Lee would have used the Army of the Potomac, unlike 
      McClellan. While the capture of Richmond would have had the same result on 
      the Confederacy as the capture of Philadelphia did during the American 
      Revolution, Lee would still have much of the Confederate army in the East 
      on the run, as well as the government.
      I will leave the Western Theater alone to occur as it happened, as its 
      importance to the overall war would be diminished with Lee commanding in 
      the East. The Battles of Fredericksburg and Chancellorsville would have 
      been substantial Union victories and would have shattered the will of the 
      Confederacy to fight on. Much of the success of the Confederate army lay 
      in the character of Lee and his leadership abilities. Combine those 
      attributes with the advantages the Union had in terms of manufacturing and 
      sheer numbers and Lee’s Union army would have been a very difficult foe to 
      defeat.
      Now this is not to say that the Confederates would stand no chance in 
      such a situation, as they did have some able generals besides Lee. If Lee 
      were in command of Union forces, there are many likely possibilities for 
      commander of the Army of Northern Virginia, like Jackson, Longstreet, Joe 
      Johnston, and Beauregard. Any of these men would have been a worthy 
      opponent for Lee, but I again return to Lee’s abilities, the manpower 
      advantage of the Union, and the manufacturing capabilities of the Union, 
      which would have overwhelmed any of the four.
      I will claim that the war, with Lee commanding the Union Army, would 
      have been over by late 1862 or early 1863. Grant would have ended up an 
      irrelevant officer in the West, perhaps at Major General, but would not 
      have had the opportunity to rise as far as he actually did. While Grant 
      may one day rise to the presidency in this hypothetical scenario, I doubt 
      it would have been as assured. I will say that given Lee’s views on 
      secession, the 1864 election may have been quite interesting, as with the 
      war won, Lincoln would stand a chance to win re-election, and Lee, as 
      victor over the enemy would be a logical choice for Vice President on a 
      reconciliation ticket. The ticket wins and Lincoln and Lee usher in the 
      desired Reconstruction that Lincoln intended. After this, who knows?
      One thing is certain, we will never know how things would have turned 
      out with Lee commanding the Union army, but that does not mean we can not 
      speculate as to what may have happened. Overall, I submit that the war 
      would have been shorter and less costly than it actually was, that Grant 
      would not have risen to national prominence, as he was overshadowed by the 
      equally successful Lee in the East, and, that Reconstruction would have 
      gone much differently, especially under a reconciliation ticket of Lincoln 
      and Lee.
      I have set up my scenario, now it is your turn. Let me know where I may 
      be wrong, or submit your own scenario of Lee taking Lincoln’s offer in the 
      comment section.