The question is very broad how you put it.
They should to some extend, but they also should be able to be different for instance to preserve their own culture.
So probably I will answer this with a NO. As working together will only play in the hands of the globalists. But then again. If the greed driven warmongering globalist would be out of the equation, then most, if not all, countries actually would have a chance to work together to some extend.