How did Europe achieve the Union?

The European countries have succeeded to establish a union after long centuries of religious and political clashes with each other. Though they are not totally free of problems, currently they have a political union which functions mostly worry-free. This is because that the European countries reached almost a common and similar level and ground in politics, economy, science and technology and world view that they nearly abolished all kind of borders between themselves and they adopted a good way of living together. Particularly in the middle ages, what was the…

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