How did Monopoly become one of the most popular games of all time?

Who was the true inventor of Monopoly? Where do the properties get their names from?  Why was the original Monopoly board round-shaped? For free home activities sign-up at www.WhoSmarted.com See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.