Champ-de-Mars (shäN-də-märs) [key], former parade ground of Paris, France, between the École militaire and the Seine River. There, at the Fête de la Fédération (July 14, 1790), Louis XVI took an oath to uphold the new constitution. On its vast grounds several expositions were held, notably that of 1889, when the Eiffel Tower was erected there.
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