 In March 1860, however, as Piedmont was in the process of annexing Parma, Modena, and the Marches, Napoleon III agreed to sanction Piedmont's Italian acquisitions in exchange for Nice and Savoy.France annexed the provinces by the provisions of the Treaty of Turin, signed on 24 March 1860.There followed plebiscites in Nice on 15 and 16 April and in Savoy on 22 and 23 April, in which the vast majority of the inhabitants of the two territories voted to approve the treaty and join France.