It is not a secret. It is just something joe sixpack didn’t bother to find out, the MSM didn’t want to report, and politicians - and especially other arab countries - want to ignore.
Anyone with more than a passing interest in the history of the “Palestinian” people has known this for a long time.
"Anyone with more than a passing interest in the history of the “Palestinian” people has known this for a long time."
If you read the other comments, you will see the necessity of repeating this theme.