The Southern colonies were the ones with the big plantations, where they needed lots of people to work the fields. And slaves were the cheapest labor force available. New York and New Jersey didn't have as much large-scale farming, so not as much use for slaves.
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Ferderick Douglass
The raid headed by John Brown on the Federal arsenal at Harper's Ferry in Virginia was ended by Colonel Robert E. Lee's force of US Marines. Brown's idea was to gain arms and then rally slaves to revolt for their freedom. It was an attempt by a small band of men to begin the end of slavery in the USA. No slaves rallied to Brown's cause. Brown was convicted of treason and hung in 1859. The armed attempt by Brown, however made him a martyr for radical anti slavery abolitionists in the North. In matters such as the movement to end slavery, acts as those performed by Brown, served as a lightning rod to rally as much Northern support as it could.
They had far fewer large cities than the southern states. They generally had less enslaved labor than the southern states.
It was more-or-less a draw. Neither army was destroyed, though the casualities were high. Eventually the Confederates (Bragg) withdrew, so it was chalked-up as a Northern victory under Rosecrans.
From his appointment until Grant's Overland Offensive of1864, Lee was able to stave off every general who led the Army of the Potomac against him. His audacious spoiling attacks sent general after general back to Washington in defeat and disgrace. Unfortunately, he was much less capable when mounting offensives on northern soil, but his aggressive elastic defense of Northern Virginia was little short of supernatural.