Exactly! That's similar to what I feel about the UN! Besides, it doesn't matter if we had World War III or a civil war on Earth under one goverment - the result would be the same.
There is the historical trend - at first, there were tribes during the Ice Age, then farming villages arose about 9,000 years ago. City-states started during the time of Mesopotamia, one of the oldest large-scale civilizations about 6,000 years ago. Finally great empires like the Romans and the Chinese went up about 1000 years before Christ. Nations as we know it began during the Middle Ages in the form of kingdoms in Europe, then later, the modern republic was born in the late 18th Century after the French revolution. So, now we are living in the age of a truly global but highly fragmented civilization begun during the late 19th Century, with truly global trade. Anyways, enough of this history lesson - hence the trend towards blocs and continental governments
This is why I voiced the trend I posted earlier - it's pretty logical - and a bit scary. Why? Besides a really big civil war, there's bound to be a coup, or an authoritarian government, God forbid. Even if Earth was a single global nation, cultural traditions and languages will continue to be protected to an extent and survive. In short, a one government Earth will not be one culture, but still a multitude! There'll still likely be individual and different nations, just that they're going to be all under one higher level of government. But Earth is heading towards an economic global hegemony, and it doesn't really matter whether big corporations and other monied interests or governments are responsible. Hell, a European from before the time of Napoleon would've likely thought the idea of a European Union, even as an economic bloc a bit crazy!