There never was such a place though. And even if the Arabs had won the war in 1948 and wiped Israel out, there still wouldn't be a state called Palestine. That's because Egypt, Israel & Jordan all claimed the territory and saw it, or parts of it, as being part of their country. That's not speculation either. It's well documented.
In 1948 Jordan controlled the whole West Bank. Did they create a Palestinian state? No. They annexed it. And the Egyptians placed the Gaza Strip under military control.
There has never been, nor would there have been, an independent, sovereign Palestinian state.