Politically, I consider myself to be an anarcho-capitalist. Thus, I think the ideal state of political organization for all people would be a stateless free market society. There would be no borders or governments. People would associate and work with each other on a completely voluntary basis.
I would consider that a much much more untied world compared to what we have today. Ultimately, I think we will move towards this in the distant future, but it is a slow process.
Now if you are referring to a "united" world in terms of a world government then I would say that it is a terrifying idea, and I hope that we never even get close to something that destructive (things are bad enough as it is).