A tour of the principal socioeconomic, intellectual, and political events and trends of the 20th century through the 1980s. Key observations: political violence is infectious and degenerative in nature; it is highly important for leaders to be seen as moral and ethical. In the last century, the left was responsible for the bulk of the disastrous experiments with social engineering in Russia, China, and various socialist outposts, but the right also participated as in Germany, Italy, and Spain. The author convincingly points to the enduring role of individual agency as well as the law of unintended effects. Because he is not a professional academic and is conservative, he is considered idiosyncratic but his conclusions have never been refuted.