In an alternate timeline, Churchill made a wartime unity speech to improve Allied morale which was broadcast over radio in 1944. Aboard Enterprise, Hoshi Sato picked it up and replayed part of it for T'Pol, Tucker, Reed and Mayweather: "…as to the youth of all the Britons, I say, 'You cannot stop.' There is no halting-place at this point. We have now reached a stage in the journey where there can be no pause. We must go on. It must be world anarchy or world order." (ENT: "Storm Front")
The speech was an actual speech by Churchill, called "The Gift of a Common Tongue" (aka "The Price of Greatness") . It was in reality delivered on September 6, 1943 at Harvard University in Cambridge, Massachusetts. (Star Trek Encyclopedia (4th ed., vol. 1, p. 143)) Presumably the alternate speech was delivered under different circumstances, since Massachusetts was under German control. In fact, Churchill's whereabouts or activities at this time are wholly unclear, as England too had fallen to Hitler early in the war.