unification of public pension plans

unification movement
統一運動

unification of a country
《the ～》国の統一［統合］

unification of forces
力の統一

unification of plurals
複数の統合

unification of public pension plans
公的年金の一元化

unification of the nation
国家の統一

unification plan
統一案

unification problem
単一化問題