For what reason Britain sold palestine land to Israel?

by chairmanvod

According to one "historian" says that the Zionists led by Chaim Weizmann and the British government had negotiated that if they managed to have the United States join the British side in the First World War, then they would be given territory in Palestine, that is true or is only a farce invented by an pseudo historian.

tayaravaknin

Can you source this claim? Which "historian" is claiming it, and where?