Whites in the northeast are the ones to first bring slaves to the USA.
The main reason they backed away from African slaves is because of higher skilled cheap European immigrant labor at the start of the Industrial Age.
Additionally, some of the greatest violence against blacks was in the northeast.
They won the war so they got to write the history.
Whites essentially quarantined blacks up here; there has never been integration (and I doubt there ever will be). It exists only on the books; the reality is much different. Here in NJ we’ve had our own miniature version of the South Boston busing issues; any white population that even hears a rumor of busing withdraws their children from the impacted district.