Translate the following English sentence to French:
"The shared objective of the fifteen Member States to create a European Union which is ever more closely bound, particularly comprising an area without internal borders, could not be achieved in full without a single currency."
L'ambition commune des quinze États de créer une Union sans cesse plus étroite, comportant notamment un espace sans frontières intérieures, ne saurait pleinement aboutir sans une monnaie commune.