Sorry my explanation was not sufficiently precise.
Yes, resolution 181 (November 1947) granted a homeland for Jews, but not at the expense of the indigenous inhabitants:
Resolution 181.
Between November 1947 and may 1948 that resolution was trashed by the then Jews, when they embarked on the crusade of genocide, against the Palestinians who were the indigenous inhabitants, now recognised as the Nakba
And as you point out "Israel" declared Unilateral Independence in May 1948, which was not ever envisaged in the resolution 181. The resolution always called for economic union between the partitioned parts of Palestine.
So Israel trashed the resolution in the 6 months from November 1947 and May 1948, then again when they declared Unilateral Independence.
Agreed the Arab nations never accepted the authority of Resolution 181, but why should they, it was their land, not to be divided by some overarching authority created by mostly western nations, with their self interest foremost, i.e. Britain's desire for the support of Jews in WW1.
The Arab nations generally supported Britain in WW1, and they were promised a unified Arab territory, but Britain reneged on that promise.
In conclusion I believe that Resolution 181 was fundamentally flawed and has led us to this present position.