The North–South localities-alliance movement in the particular period of the country (1954–1975) created the relationship between the three cities of Hanoi – Hue – Saigon. Historical fact shows that the relationship between the three cities has been formed and has developed for a long time. The relation axis became the rear-front coordinate axis in the period of the resistance war in modern times. In the period of peace, development, and integration, this relation axis needs to promote and expand historical values and create new practical benefits, following the axis of heritage and national security.
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