regionalization
noun [ U ]
( UK also regionalisation) uk/ˌriːdʒənəlaɪˈzeɪʃən/ us/ˌriːdʒənələˈzeɪʃən/ ECONOMICS, POLITICS
the way that an area of the world containing several countries becomes more economically or politically important than the particular countries within that area:
Economists have noted the increasing regionalization of different parts of the world into trade blocs.