Bauer states migrations cannot be stopped but borders can regulate them. Liberal deregulation since 1970s collapsed migration controls. West incentivized population inflows outside crises. Continued natalité drop in Occident risks no population to replace. France faces 1 million fewer pupils by 2029. Europe fertility fell from 1.54 to 1.38 children per woman 2012-2023. France unprepared for 2.8 million dependent seniors by 2050. Japan enters accelerated population decline with aging workforce. China natalist measures fail to boost births post-one-child policy. French dénatalité is social fact before biological. Generation Z shows refusal to breed due to sex wars and commitment fears. Natalist policies like paid leave and childcare proposed but efficacy uncertain. School closures pit secular against Catholic institutions amid pupil drop.