Although New England seems to be doing well since earlier in the summer, we did NOT do well overall. For example, MA at #3 has had 8831 deaths for 6.9M people. The average age of the dead is 82, 65% of all deaths from long term care homes [2] -- this was a failure to protect the vulnerable.
As for NE cases being imported, we saw a small uptick on Cape Cod with vacationers (resulting in Baker's recent travel order) but the back-to-school has only found a few dozen positive cases over the last few weeks despite massive and ongoing testing [3].
I'm not sure your comment about "most of the European countries" is correct. France is seeing near-record cases [4] Spain has seen a very significant surge [5] resulting in a lockdown of the Barcelona area and Germany is also seeing a worrying uptick in cases [6].
[0] https://www.statista.com/statistics/1109011/coronavirus-covi...
[1] https://www.statista.com/statistics/1104709/coronavirus-deat...
[2] https://www.mass.gov/doc/covid-19-dashboard-september-1-2020...
[3] https://old.reddit.com/r/CoronavirusMa/comments/ig1n1x/curre...
[4] https://www.worldometers.info/coronavirus/country/france/
[5] https://www.worldometers.info/coronavirus/country/spain/
[6] https://www.worldometers.info/coronavirus/country/germany/