If they disappeared then shit would go down, Economy would do into the drain. The people? would they cease to exist or become refugees..... Israel would start to worry because they won't have america to help them anymore.
If they never came into existent then we would all be typing in some other language. Palestine would still be there, Hitler could of won the war, yadda yadda yadda. The world could change all over or it would be pretty much the same except for small differences.