Some of you don't know the difference between history and propaganda.
Read a book.
The British had no business doing that, that was the point, especially since they gained the land by deceit.
They got the Arabs to revolt under the promise of independence, and then said, "Hey, here's a good place to dump all those Jews Europe doesn't want."
Well, no, they didn't. The British kept Iraq, Palestine and Jordan for themselves and gave Lebanon and Syria to the French.
If they had been honest about their intentions, the Arabs might have joined the Ottomans instead of the Allies.