A political union refers to when different places or countries come together and form a unified government to work and make decisions together. Full definition
I think the great majority of British people don't want to be part of political union. (conservativehome.blogs.com)
It would be the best solution for all involved, after all, currency unions have never worked without political union. (alephblog.com)
They need to recognize that political unions between disparate economies are held together by transfers of wealth from richer to poorer. (canadianbusiness.com)