From the treaty of Rome to the Maastricht treaty, the European Union has spread. However, in order to avoid a North-South divide which would split France in two, Europe has to fight against the natural and divisive preference of the northern countries for the north and of the southern countries for the south.
DORNIER, P.P., BANSARD, J.P., BATAILLE, M.M., BAUDET, M., BOURASSE, P. and BOURNAT, M. (1997). De Rome à Maastricht : cap au Nord ? Athéna, pp. 97-108.