In a word: Demographics
>male bias sex ratio, ~51.3%ncbi.nlm.nih.gov/pmc/articles/PMC4413335/>used to be mitigated by higher rates of miscarriage, infant mortality, and fatalities in tribal warfare>no longer the case due to medical advances, resulting in persistent male surplus>coupled with inverted population pyramid in developed worldDarrell Bricker
Empty Planet: Preparing for the Global Population Decline
youtube.com/watch?v=bSAgHvETNSg>developing world has male child preference and achieved through sex selective abortion and female infanticideValerie Hudson
The First Political Order
youtube.com/watch?v=q_I1Cja1czk>resultant demographic imbalance, male/female and old/young have massive geopolitical repercussionsPeter Zeihan
Disunited Nations
youtube.com/watch?v=3_GrDbcC0N4George Friedman
The Storm Before the Calm
youtube.com/watch?v=8qbhWdorC4M>men are checking out of society, nothing to live forDr. Nicholas Eberstadt
Men Without Work
youtube.com/watch?v=d43Z3GnTrqs>this is a precursor to chaosPeter Turchin
Historical Dynamics: Why States Rise and Fall
youtube.com/watch?v=TttZmYRIILU 
