“Great Britain is in a better state than at any former time to inflict a severe blow upon and to read a lesson to the United States which will not soon be forgotten.”

Widely attributed to Shaw begin31 (187ning in the 1940s, esp. after appearing in the November 1942 Reader’s Digest, the quotation is actually a variant of "Indeed, in many respects, she [Mrs. Otis] was quite English, and was an excellent example of the fact that we have really everything in common with America nowadays, except, of course, language" from Oscar Wilde's 1887 short story "The Canterville Ghost".
Misattributed
Variant: The English and the Americans are two peoples divided by a common language.

1860s, Speech in Austin (1860)

The Crisis No. XIII
1770s, The American Crisis (1776–1783)

Statement to Japanese cabinet minister Shigeharu Matsumoto and Japanese prime minister Fumimaro Konoe, as quoted in Eagle Against the Sun: The American War With Japan (1985) by Ronald Spector. This remark would later prove prophetic; precisely six months after the attack on Pearl Harbor, the Japanese navy would suffer a major defeat at the Battle of Midway, from which it never recovered.

Source: "Let the Record Speak" 1939, “The Truth about Communism” https://babel.hathitrust.org/cgi/pt?id=mdp.39015051180423&view=1up&seq=5 (1948), p. 16

2000s, Where the Right Went Wrong (2004)

Speech as Home Secretary on the UK and European Union https://www.gov.uk/government/speeches/home-secretarys-speech-on-the-uk-eu-and-our-place-in-the-world (25 April 2016)

"The Conquest of the United States by Spain”, speech at Yale 1899 http://oll.libertyfund.org/titles/sumner-boll-11-w-g-sumner-the-conquest-of-the-united-states-by-spain-1898.