All for Australia (1984)
“War tore the guts out of the British empire, weakening it in resources and morale. The first major loss was Ireland.”
Source: A History of the British Isles (1996)
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Jeremy Black (historian) 1
British military historian 1955Related quotes

“We are loyal to the Empire first and foremost because we are of the British race.”
Speech during the 1917 federal election campaign (c. March 1917), quoted in Neville Kingsley Meaney, Australia and World Crisis, 1914-1923: Volume 2 (2009), p. 202

Speech at Kensington Town Hall ("Britain Awake") (19 January 1976) http://www.margaretthatcher.org/speeches/displaydocument.asp?docid=102939
Leader of the Opposition

King Albert I of Belgium's diary entry (7 February 1916), quoted in R. van Overstraeten (ed.), The War Diaries of Albert I King of the Belgians (1954), p. 85.

Broadcast, Radio Cologne, 8 April 1943.

The Education of Henry Adams (1907)
Context: p>The result might have been stated in a mathematical formula as early as the time of Archimedes, six hundred years before Rome fell. The economic needs of a violently centralizing society forced the empire to enlarge its slave-system until the slave-system consumed itself and the empire too, leaving society no resource but further enlargement of its religious system in order to compensate for the losses and horrors of the failure. For a vicious circle, its mathematical completeness approached perfection. The dynamic law of attraction and reaction needed only a Newton to fix it in algebraic form.At last, in 410, Alaric sacked Rome, and the slave-ridden, agricultural, uncommercial Western Empire — the poorer and less Christianized half — went to pieces. </p

“It is the end of the British Empire.”
Remark to Harold Nicolson (22 September 1938) after Neville Chamberlain flew to Godesberg to meet Hitler, quoted in Harold Nicolson, Diaries and Letters, 1930-1964 (London: Penguin, 1980), p. 134
The 1930s

4 February 1945.
Disputed, The Testament of Adolf Hitler (1945)

“Europe needs an army to fight the resource wars of the twenty-first century.”
Variations of this have circulated among Irish and left-wing Eurosceptic groups. Delors explicitly denied making any such statement in 1992 and 1998 in the leadup to Irish referendums on the Maastricht and Amsterdam treaties. Commentators have found no evidence for it.
Attributions:
[Facing the threat of Brussels rule at our expense, https://www.irishtimes.com/newspaper/archive/1991/1121/Pg014.html#Ar01400, 30 July 2019, The Irish Times, 21 November 1991, 14, subscription, Anthony, Coughlan]
[Proinsias, de Rossa, https://www.oireachtas.ie/en/debates/debate/dail/1991-11-29/3/#para_191, 29 November 1991, Dáil Éireann debates, Maastricht Summit: Motion]
[Maastricht and neutrality : Ireland's neutrality and the future of Europe, John, Maguire, Joe, Noonan, 1992, Cork, People First/Meitheal, 19–20]
[Fox, Carol, Gearing up, 25554848, Fortnight, 1994, 334, 11–12: 12, 0141-7762]
[Joe, Higgins, https://www.oireachtas.ie/en/debates/debate/dail/1997-10-16/24/#para_608, 16 October 1997, Dáil Éireann debates, Amsterdam Treaty: Statements (Resumed)]
Edward, Spalton, 4 July 2004, (Letter) Fashion statement, Daily Telegraph https://www.telegraph.co.uk/comment/letters/3608033/Fashion-statement.html,
John, Boyd, Campaign Against European Federalism, Europe for Peace Conference, Manchester, 5 March 2005 https://web.archive.org/web/20070809083941/http://www.gmdcnd.org.uk/events/europeconference/amC.htm,
[Gibson, Dirk C., Commercial Space Tourism: Impediments to Industrial Development and Strategic Communication Solutions, 2012, Bentham Science Publishers, 9781608052394, 12, https://books.google.ie/books?id=hSkW9TW3omEC&pg=PA12, 21 July 2019]
The European Alliance of EU-critical Movements, EU Counter Summit Statement, London, 7 November 2015 http://teameurope.co/statements.html,
[The financial cost of signing up to PESCO, https://people.ie/news/PN-178.pdf, People's News, People's Movement, Dublin, 178, 20 December 2017]
Morning Star, Macron calls for joint EU army project to step up a gear, 27 August 2018 https://morningstaronline.co.uk/article/macron-calls-joint-eu-army-project-step-gear,
Refutations:
The Irish Times, subscription, 12 June 1992, 12, Colm, Boland, 'Interference' by Delors denounced https://www.irishtimes.com/newspaper/archive/1992/0612/Pg007.html#Ar00701,
[30001811, Ireland's Foreign Relations in 1992, Patrick, Keatinge, Irish Studies in International Affairs, 4, 1993, 72 [footnote]]
McKenna's case not a Euromyth, 15 May 1998, Patrick, Smyth, The Irish Times https://www.irishtimes.com/news/mckenna-s-case-not-a-euromyth-1.152890,
Misattributed