Canning returned to London later that year, and helped to found the "Quarterly Review". In June 1814 was appointed Envoy Extraordinary and Minister-Plenipotentiary to Switzerland, where he, along with the other allied representatives, helped negotiate Swiss neutrality and a new Swiss federal constitution. In October he went to Vienna, where he acted as an aid to Lord Castlereagh, the British representative at the Congress of Vienna. After the negotiation of Swiss neutrality in 1815, Canning's role there became dull to him, but he stayed until 1819, when he was recalled and sent to Washington as Envoy Extraordinary and Minister-Plenipotentiary to the United States. Although he hoped for major accomplishments in Washington that would allow him to move up to a larger position, he was largely unsuccessful. The initiative of his cousin George, this time as Foreign Secretary, for a joint Anglo-American guarantee of Latin American independence, led to the promulgation of the Monroe Doctrine. In 1820 Canning was made a member of the Privy Council.