Palestinian country or state never existed - as a geographical region yes, but not as an independent state
The Palestinian cause is a reaction to the Jewish cause.
This is what Zuheir Mohsen said
The Palestinian people does not exist. The creation of a Palestinian state is only a means for continuing our struggle against the state of Israel for our Arab unity.
For full quote
https://en.m.wikiquote.org/wiki/Zuheir_Mohsen#:~:text=Quotes,%2C%20Palestinians%2C%20Syrians%20and%20Lebanese.