The IAU Strategic Plan 2020-2030, a blueprint for forging a new social revolution in astronomy and for using astronomy as a tool for building a progressive society

I discuss the second IAU Strategic Plan for the decade 2020-30 in the context of the overall evolution of the IAU in recent past decades. This article shows how the IAU has evolved dramatically since WW2. It is hardly recognizable in terms of its original organization and goals of a century ago. What was once an inward-looking body engaged purely with the procedures of astronomical research is now a dynamic and outward-looking organization, interacting with people, especially students and the public.