Wow! I didn't know it was possible to put some much distorted history into a couple of paragraphs.
Sorry to bust your cute little PC bubble but Lincoln didn't invade the South to end slavery.
Second, the Confederate Army was much better led and with far better soldiers than the Union. The reason the South lost was for the same reason Germany and Japan lost in WWII; American industrial power. The Union was better equipped and supplied than the South. As the Union Army burned and destroyed everything in their path invading the South, this situation worsened until the South could no longer sustain an army.
I know slavery was not why the North fought -- Southern insurrection was why the North fought.
However, slavery is the reason why the South seceded. The South seceded because Lincoln was elected President in 1860. Lincoln was a Republican and the Republican Party wanted to end slavery.
Lee and Davis were both god awful. In fact, if you switched Lincoln and Grant with Davis and Lee, the South would have won the war.
Being better equipped and supplied means nothing. History has proven this time and again. England was better equipped and supplied during the Revolutionary War. The U.S. was better equipped and supplied during the Vietnam War. That's a poor excuse for the South's horrible overall strategy for fighting the war.
Lee destroyed his army both at Antietam in 1862 and at Gettysburg in 1863. Both invasions of the North were stupid as hell. If Union General McClellan had been more aggressive at Antietam, he could have forced Lee's surrender during that battle. Lee's army was trapped with their backs to the Potomac River. If Grant was in charge of Union forces at the time, Lee would have surrendered at Antietam in 1862. And then Southern "heritage" would be ridiculing Lee the same way General Custer is now ridiculed.
This should have been the strategy of Davis and Lee during the whole war -- Fight a defensive war and make the war last as long as possible. That way, Lincoln probably doesn't get re-elected in 1864 and then the new President negotiates a peace settlement with the Confederacy.
Because of the North's success at Gettysburg (due to Lee's idiocy) and then the surrender of Atlanta in 1864 (also an indirect result of Gettysburg), Lincoln won re-election and the rest, they say, is history. However, if both Davis and Lee were smarter and avoided stupid offensive attacks, history could have been very different.