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En unión y libertad (Spanish for "in unity and freedom") is Argentina's national motto. It appeared for the first time on the earliest Argentine gold and silver coins, as established by the 1813 General Assembly during the War of Independence of the United Provinces of the Río de la Plata from the Spanish Empire. It can be seen in all peso coins and banknotes currently in circulation.
References
En unión y libertad Wikipedia(Text) CC BY-SA