But it didn't take long for Britain to give Transjordan aka the East Bank of the Jordan to the Hashemites, from Saudi Arabia. They financially and diplomatically supported their new/fake/pet country for decades.
The inevitable is starting to happen. There are serious cracks in the Hashemite Kingdom. There's a limit how long foreigners can rule.
For the last two years, Jordan has been witnessing regular protests calling for reform, with some demanding the king give up his powers.  On November 15, 2012, massive protests broke out in Jordan after the Jordanian government, in compliance with the requirements of the International Monetary Fund, raised fuel prices. Protests, as The Independent noted, swept the country, “with most chanting for toppling the regime” despite the fact that protesters had previously “rarely targeted the king himself.”
For the first time, the Palestinians engaged fully in the protests; As Al-Jazeera reported, Palestinians, including those from refugee camps, have been fully involved,  calling for toppling the regime in most of their major residential areas, including the Al-Baqqa refugee camp , the Al-Hussein refugee camp, close to downtown Amman  Douar Firas , Jabal Al-Nuzha, , and the Hitteen refugee camp .
And there's also a limit how long a country without any real history, common culture etc can stay united and peaceful. The land was pretty empty when Britain invented Jordan. It was easy to give it to the Hashemites, because there had never been more than nomads, villages and towns. There was no regional culture. There had never been an independent country based only in that part of the work. It had been part of the Biblical Jewish Kingdoms, from the time of Joshua, which even predates the kings. Two and a half Jewish tribes lived there, their capital being Shiloh and later Jerusalem.
Anarchy on the other side of the Jordan, visible from my home in Shiloh, will probably last quite a while. Actually, Israel is usually safer when Arabs fight each other. The only thing that unites them is their aim to destroy the State of Israel and murder/terrorize Jews.
Let them continue to fight each other...