What event lead to the constitutions creation?
There wasn’t any one event but if you must choose only one event, it would be the invention of the moveable type by Johan Gutenberg. That set everything else into motion for the creation of the United States. When people were able to read and express ideas, which used to be a new concept. The old ways slowly died out in most of the world. States like Cuba and now Venzuela, and China, Myanmar, and North Korea still hang on to the old concepts but for most of the world, individual Liberty is doing well.