WO 261/571
Still more than three months before the end of the Mandate, both the British and the Americans knew with certainty (if they ever believed otherwise) that the Palestinians would not get the state they were promised.
Key to the documents’ meaning is that they refer to Abdullah’s portion of the spoils not as the Palestinian side of the Partition, but as “the area of Palestine not under the control of the Jewish State”. In other words, both the Partition itself, and the promise of a Palestinian state on one side of it, were fraudulant.
State of Terror, 250-251
FO 371/68648
The British acknowledge the deal that the Zionists were striking with Jordan’s King Abdullah, and rather than any objection to this abrogation of Resolution 181 and the betrayal of the Palestinians, the US administration was “happy” with it, and the British saw “certain advantages” in it for themselves.
State of Terror, 250-251
FO 371/68648
This is the relevant page of the "telegram No. 462" referred to above.
State of Terror, 250-251
FO 371/80273
Two years later this secret British report reaffirmed it: in early 1948 it had been “assumed that Jordan would absorb the eastern part of Arab Palestine”—no Palestinian state.
Meanwhile, new CIA assessments during February and March reaffirmed its own earlier warnings: the Zionists will ignore Resolution 181 and try to “set up a Jewish state in all of Palestine and Transjordan”
State of Terror, 250-251