It wasn't "their" country, k*nt. Maybe they should have taken it up with the Ottomans who lost "their" country by waging war against the west, k*nt.
I think you are a little confused.
The West got the Arabs to revolt against the Ottomans on the promise that they would get independence. Then the British, who are pretty much the masters of fucking up everything, decided, "Hey, do you know what would look good here? A Bunch of Jews we are throwing out of Europe!"