Because its actually Palestine, it was land given to them, and now they want to steal more of it. thats why they fight over the gaza strip.
The Arab-Israeli War granted Egypt control of Gaza.
Before Israel became a nation, the majority of people dwelling in the region were Palestinians—Arabs who lived in what was then known as Palestine. On May 14, 1948, Israel was officially declared a state, marking the first Jewish state in over 2,000 years.