After world war ii, why was there conflict between the israelis and palestinians?

Illegal jewish immigrants from Europe formed terrorist gangs and attacked the British Administration and the local population of christians and muslims in Palestine. 
The British Administration gave up and handed the problem to the UN who decided to reward the terrorists in 1948 with their own state called Israel 
This was done by a program of ethnic cleansing in which many Palestinians were murdered and thousands of others fled to refugee camps in adjoining countries.

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