In 1873, following the abdication of Amadeus, Duke of Aosta, as King (1870–1873) and with Spain's change from Kingdom to Republic, the Spanish government issued a new colonial flag for Puerto Rico.
In 1873, following Amadeus' relinquishment of his royal status as King (1870–1873) and Spain's transition from a monarchy to a republic, the Spanish government introduced a new colonial flag for Puerto Rico.