No. The Midwest and the Western states were also just as much opposed to slavery, but both are red/purple today. Even for New England, if NE had the same demographics today as it did then, it would probably be only 50-60% D instead of 60-70%. There is no simple answer, but
There is an argument to be made New England was less against the abolition of Slavery than the Midwest and West.
Lincoln carried New York by 1% or 7,000 votes
Pennsylvania by 3% and 18,000 votes
Connecticut by 3% and 2,000 votes
New Hampshire by 5% and 3,000 votes
If the Battle of Atlanta had gone a different way it is extremely likely that Lincoln loses in 1864 and General McClellan is President.
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