Your answer that fills in the blank is: Social Security.
Because of the weakness of non-states (ones that werent official, just groups of people who called themselves states), and European powers had strong econimies and a well organized government. Hope this was useful :P
Introduction
(What place you are going to be talking about)
Body 1 (Geography)
Body 2 (Economy)
Body 3 (Culture)
Conclusion
(Just sum it up)