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Oddly you write about Arabs welcoming Israeli's in the 1920's, but omit the killings and massacres by Arabs against Israeli's during the latter part of the 19th Century.
Here's a good read for you:
Your Guide to Understanding the Roots of the Israel-Hamas War
That is because all the killing were caused by these well armed Jewish illegal immigrants, who lied about their intentions.
People talk about things like the Hebron riots, but the truth is a Zionist deliberately started the riot by shooting an Arab strawberry vendor to death, over a price argument.
The Zionists were well armed, and the Palestinians unarmed.
There were about 200 deaths on each side.
All the violence was caused deliberately by the illegal Zionist immigrants.
That is obvious since it was Menachim Begin who blew up the King David Hotel, to get rid of the British peace keepers.
He also gunned down Folke Bernadotte, the UN moderator, again so there would be no one to stop the intended genocide against the native Arabs.
Then compare a map of Palestine before 1946 to one after 1950, and you will see hundreds of Arab villages missing, wiped out by Zionists bent on genocide.
Look up the massacre of the village of Deir Yassin for example.
Do not look at propaganda like Bloomberg.
Although I read the link and it was not as bad as most, it still totally ignored the mass murder, theft, lying, etc., done by the Zionists, and totally tried to blame the Arab for the violence, when historically and in actuality that is totally false.
Moslem never harm Jews, and are forbidden to harm Jews by the Quran.
The Turks, British, etc., never allowed the Palestinians to be armed.
In contrast, the US provided the Zionists with whole arsenals of tanks, bombers, fighter planes, machine guns, etc.
It was massacre after massacre.