Again, our world is gradually dividing into more countries, not fewer.
This isn't about the quantity of specific nations, it's about the way in which they are governed or managed administratively.
Even in Earth's global government in 24th century Star Trek canon, individual countries still continue to have their own identities and particular trademark cultures, but they are governed and represented by a global body, and importantly people's identities are most represented by their world, and the inherent diversity therein. The EU for example is a singular entity. It has (or is supposed to have) a single currency etc, and yet the individual countries in the EU still retain (most of) their identities. Global government doesn't automatically equal cultural homogenization.
The goal of the powerful internationalists in recent history is that of world government - and this has given some people in the world cause for concern. This is, to an extent understandable; giving up much of the autonomy of your beloved nation state to a single, centralized global force must be a daunting prospect to some.
But global governance and a United Earth is a given. It is a most necessary next step for human kind. We just need to never lose sight of our humanity, especially during the birth-pains of such a system, and the crises which are needed to give rise to it.
"Some even believe we (the Rockefeller family) are part of a secret cabal working against the best interests of the United States, characterizing my family and me as ‘internationalists’ and of conspiring with others around the world to build a more integrated global political and economic structure – one world, if you will. If that's the charge, I stand guilty, and I am proud of it."
(David Rockefeller, Memoirs 2002)
"It is the system of nationalist individualism that has to go... We are living in the end of the sovereign states... In the great struggle to evoke a Westernized World Socialism, contemporary governments may vanish... Countless people... will hate the new world order... and will die protesting against it."
(H.G. Wells, The New World Order 1940)
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