I loved this book in my high school AP Euro class. I revisited it much later in my studies, and was dismayed to realize how lacking in proper research and citation it was. Manchester makes numerous bold claims without mentioning resources, many of which were directly contradicted by the more thoroughly-established works I was then reading. I had learned a lot of "facts" that turned out to be inaccurate, imprecise, or speculative.
I'll let others with more knowledge correct me, but my overall impression is that he was pushing sensational narratives rather than advancing historical knowledge.
> One Summer: America
I haven't heard of this and will take a look. Thanks for the recommendation.