Spoiler alert: It has nothing to do with dividing by 2. A bio attack on Black Friday and the aftermath of a society collapsed, this is the backstory to Tom Clancy's the Division 2. To get you caught up on that storyline, the folks at Massive and Ubisoft have put together the following trailer. It goes into the lifecycle of this near future and re-settled DC, including some gameplay elements, missions, and factions.
The Division 2 releases tomorrow, March 15th on PS4, Xbox One, and PC. Player who purchased the Gold or Ultimate Editions of the game are already in with early access that started earlier this week.