Palestinians didn't exist in 1948. The term was given to the people AFTER much much time. The people themselves did exist, but they were just part of the Arab world inhabiting that region. They didn't really have a governing body other than perhaps their Sharia law. Because of their inability to understand law, they had no claim over the land. Thus when rich Jews moved in and started purchasing land they could claim it a state, as at the time there was no state imposing over the region....accept perhaps Britain. Which succeeded the land upon independence (after fighting). The original aggression of the neighboring states was due to the fact that much of that region had been training for WWII believe it or not, and a pact with NAZI Germany. How strange...
The aggression was a result of the propaganda that German backed Arab states were giving to their people...that's right...they had the same propaganda as the Germans did in WWII (Looks like you WERE part of this). When Jews moved in, they saw it as a continuation of the situation and felt with their inability to run...success would finally be theirs. They were wrong. The attacks failed and the "arab state" referenced is nothing more than the attempted creation of an Arab state simultaneous to the loss of imposed British mandates. Their failure was caused by the war, at this time for legitimize the people of the land different surrounding Arab states annexed the land and put them inside their mandate.
Ironically their succession from Lebanon in the late 80's and early 90's was backed by Israel, and the assistance of the IDF was needed in order to grant moderate independence from imposition. The land they maintained momentarily began to be lost due to the civil rights violations they enacted against Israel, at this moment annexation was imposed by Israel. Which was the second annexation (After Lebanon). Even more ironically Lebanon began to support the very people who had succeeded from it, but at this time it was under different leadership. The previous Lebanon was ruled by atleast a moderately independent governing body, now that governing body was funded through 3rd party nations.
The same myth that there ever was a palestine considered illegitimate by Lebanon until it came to benefit the 3rd party trustees in Lebanon at which time the Arab world legitimized the "state" of Palestine retroactively! Documentation at this time was altered to reflect a perpetual existence of the state and history was literally revised in much of the region under the name of "Realizing the truth, in our mistakes". A kind way of giving the people living in the region the feeling that their governments strictly enforce the truth at any costs.
So you can claim it a legitimate state all you want, but it never existed. Your governments lie to, and they spread propaganda. You can call me a NAZI, but it was your NAZI training during WWII in the region that caused the initial conflict.