I really love this topic, and thought the 10 scenarios presented here were well presented! Topics include: What if Lee had won at Gettysburg? What if JFK had not been killed? What if the US had not entered World War II? The great thing about these subjects is there is often a single event or decision that was not inevitable that, had it gone the other way, might have resulted in a different outcome which itself might have resulted in a new paradigm or branch of history. As the professor reminds us, it tells us that history nor our future is inevitable, and that "the way things were" are often no more than a happy accident of one event after another.
The only things that keep me from rounding up to 5 stars: First, the what if regarding the Salem witch trials was a little hard to buy fully, even though I appreciate where they're coming from. Second, this is one of the shortest Great Course lectures. I would really love to have more of these in one collection.