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Most (if not all) BE speakers would use 'ensure' in this context. AE speakers will speak for themselves when they get up later.
Student or Learner
4-5)Any human social world is obviously finite, limited in resources and space, and it comprises agents whose pursuit of individual ends unavoidably must limit what others would otherwise be able to do, often directly conflicting with such other pursuits. This situation forces the issue of power: who will be subject to whose will, who will subject whom. (A) , these individual agents are finite as well, unable to achieve most of their ends without forms of cooperation and dependence. The biology of human development insures a profound familial dependence throughout childhood, and the variety and breadth of the distribution of human talent and the frailty
and vulnerability of human life all insure that various forms of social
dependence will be impossible to avoid. (B) , it has long been
acknowledged that a human society
Isn't "insure" a misusage for "ensure"?