The Palestinians are the people who lived there. The Zionists expelled half of them and razed 500 villages to the ground in 1948. It was an ethnic cleansing. They denied them the right to return.
There was a Palestinian identity and there was a Palestinian society. They revolted against the Ottomans, and the British promised them sovereignty. The British betrayed them and caved to the Zionists, and the rest is settler colonialism and apartheid.