Israel has a better historical, moral and demographic claim to an undivided Jerusalem as its capitol than the Palestinians have a claim to East Jerusalem. This is both because Israel's historical claim is older, and indeed original, but also because Israel does govern all Jerusalem, including East Jerusalem, both fairly and democratically. Moreover, the idea that Jerusalem could be is not practical. If all Jerusalem becomes the capital of both Israel and Palestine, this would create all sorts of potential problems. If it was shared for example, would a baby born in a shared Jerusalem’s civic nationality be Israeli or Palestinian? And if an act is committed in Jerusalem which one nation's government recognises as a crime but the other doesn't, who decides what should be done? Different countries sharing a disputed territory but not dividing it is very illogical, even more so if that territory is the capital of both. Imagine what would have happened if the UK, France, and the USA decided to share Berlin with the USSR instead of dividing it!