This result is not surprising, given that New England is one of the most Democratic regions in the country. In 2016, Hillary Clinton won all six New England states by an average margin of over 25%.
There are a number of factors that contribute to New England's Democratic lean. One is the region's high level of education. According to the Census Bureau, New England has the highest percentage of college graduates in the country. This tends to correlate with higher levels of Democratic support.
Another factor is the region's relatively large immigrant population. New England is home to a diverse group of immigrants from all over the world. This diversity tends to lead to more support for Democratic policies, which are often seen as more inclusive and welcoming of immigrants.
Finally, New England has a strong tradition of social liberalism. This is reflected in the region's support for policies such as same-sex marriage, gun control, and environmental protection. These policies tend to be more popular with Democrats than with Republicans.
In conclusion, the New England states' Democratic lean is due to a number of factors, including the region's high level of education, immigrant population, and social liberalism.