On historical detail about the involvement of New England with slavery, why and how New England was founded, and what New Englanders, some of them my ancestors, exactly were thinking when they held slaves, and even its relations with the local Indian tribes, this book is excellent. There is detail on some of the people who kept slaves as well.
I was especially impressed by the degree to which the New England Puritans weren't at all nice people. In fact in both their motivations and their tactics, they rather resembled Trump and his people. I knew that many of my own ancestors who settled there were merchants, and some of them were also often bigoted Puritans. This book reveals that actually, profit was a higher priority than God. Also, while I knew that New England shipped goods to and from the Carribean, and participated in the slave trade, and that some of my ancestors participated in this by canoeing down the Connecticut River and along the coast, I hadn't realized that the wealthier members of the colony had active interests in both New England AND the Carribean, including, it sounds like, some of my ancestors, in addition to the Potters and the DeWolfs who everyone descended from them knows of their role in the slave trade.
I would have rated it 5, but it is seriously marred by the author's perceived need to devote half the text to moralizing about how miserable slaves were and how wrong slavery and its conditions were. Can she think we doubt whether slavery was wrong? I expect that actually she is just accumulating Progressive academic brownie points by constantly browbeating the reader with this. Most of us would just take for granted that slavery was both wrong and often miserable. Since I am listening to the book on Audible while at work, I can't just skip over what I don't want to read. The constant hyper-Progressive moralizing is extremely irritating and not at all edifying. How many times can I need to be extensively beaten over the head with, for instance, how miserable slaves felt when they got smallpox and were temporarily shipped to Barbados to get well. She doesn't just go into that once, she keeps repeating it, exactly as if she had dementia and she didn't remember she already said all of that. Atleast a dozen, so far, and I'm about a quarter of the way through the book.
Since some of my ancestors as well as the circles they travelled among are in the book, I am going to buy a hard copy.