The Second Order is the time period in which the Earth was dominantly occupied by ancient Humans and other "old" races such as Angels, Trolls, Demigods, Dragons, Dwarves, Elves, Fairies, Gnomes, Merps, and other races. The height of this time period is known as The Slaeleolithic period.
The Second Order came to an end when Humans began to overpopulate the Earth and reduced the populations of the other races as a result. Modernization and the emergence of technology resulted in the loss of "ancient technology" and "magic" being a commonplace thing. The rise of business/corporations and money became the true source of power going into the Third Order.