Just a wee bit of revisionism there
https://www.bbc.com/news/newsbeat-44124396
The conflict between Israel and the Palestinian people is one of the longest-running and most violent disputes in the world. Its origins go back more than a century.
Tensions between the Jewish and Arab populations deepened when the UK agreed in principle to the establishment of a "national home" in Palestine for Jewish people
Jews had historical links to the land, but Palestinian Arabs also had a claim dating back centuries and opposed the move. The British said the rights of Palestinian Arabs already living there had to be protected.
Jewish leaders in Palestine declared an independent state known as Israel hours before British rule ended. Israel was recognised by the UN the following year.
About 750,000 Palestinians fled, or were forced from, their homes on land which became Israel and ended up as refugees.
I could continue, but doubt you will agree that it started with the formation of an Israeli state on land that was always Palestinian.
Edit. I was going to mention the landgrab and murder in the west bank but I was beaten to it.