“The League is dead; long live the United Nations!”
Last speech before the League of Nations (8 April 1946)
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Robert Cecil, 1st Viscount Cecil of Chelwood 30
lawyer, politician and diplomat in the United Kingdom 1864–1958Related quotes

“The Revolution is dead. Long Live the Revolution”
Source: The Rise of China and the Demise of the Capitalist World-Economy (2008), Chapter Two, "Accumulation, Basic Needs, and Class Struggle: the Rise of Modern China"

Prime Minister
Source: Speech http://hansard.millbanksystems.com/commons/1919/jul/03/unprovoked-attack-upon-france#S5CV0117P0_19190703_HOC_333 in the House of Commons on the Treaty of Versailles (3 July 1919)

As quoted in "D.C. Money Will Talk" by Bob Addie, in The Washington Post (Wednesday, October 11, 1972), p. D4
Baseball-related, <big><big>1970s</big></big>, <big>1972</big>

Speech (7 December 1917), Liberal Magazine, XXV (1917), p. 604, quoted in Henry R. Winkler, ‘The Development of the League of Nations Idea in Great Britain, 1914-1919’, The Journal of Modern History Vol. 20, No. 2 (Jun., 1948), p. 105

"On the American Dead in Spain", New Masses (February 14, 1939)

Speech to the Labour Party Conference in Caxton Hall, London (12 December 1944), quoted in The Times (13 December 1944), p. 2.
War Cabinet

“Árt is dead. Long live Tatlin's new machine art.”
Grosz and Heartfield, 1920: text on their billboard at the Dada fair in Berlin

"Dreaming of My Deceased Wife on the Night of the Twentieth Day of the First Month" (《江城子·乙卯正月二十日夜记梦》), in Song of the Immortals: An Anthology of Classical Chinese Poetry, trans. Yuanchong Xu (Beijing: New World Press, 1994), p. 202