You mean like the charter that created the state said it couldn't do? And the body that created it said was illegal and has repeatedly demanded it give back?
With all due respect to the UN division plan, it had no effect on the ground. Israel exists not because of this plan, but because thousands of Israelis died in our war of independance to stop the Arab invasion.
Also, I want to comment on a few other issues people have brought up:
- The one state solution - I really don't see any advantage to it. Jews want a Jewish country, Palestinians want a Palestinian country. The two cultures aren't similar and the two people are bitter enemies. It would be like creating a worst version of Iraq or Lebanon - an artificial country whose borders have nothing to do with the nationalities who live in it, which doesn't really have a coherent culture and in which the populations will fight each other. In other words - violence will get much worst while no side will be happy with its country.
- Who the land belongs to - unlike VRWCAgent, I take a secular view. I believe that land division can't be based only on historical justice, but should focus on the current realities on the ground. This is true not just for Israel, but for dozens of other countries whose population today isn't the same that it was in older times (and that includes most if not of europe). The problem is that the UN works not based on justice or logic, but on popular vote, which is hardly the way just or effective solutions can be achieved. This is why there are villages cut in their middle by borders (like rajar) and this is why, for example, Um al fahem is considered Israel despite being a large Arab city, while a large part of the Jordan valley has only Israelis living in it but isn't considered Israeli.
- The division of Jerusalem - Israel already made several proposals which included the division of Jerusalem, the most recent was made by PM Olmert. It's true that these plans weren't brought for a public decision (because the Palestinians rejected them), but Olmert's party did get the most votes in the last elections, which is as close as it gets to supporting his plans in a parliamentry democracy.