It’s really a fight over land. Jews trace their Biblical roots there; Palestinians, who’ve lived there for many centuries, say it now belongs to them.
At the time of Israel’s founding in 1948, Jews had been vulnerable exiles without a country of their own since they were expelled from their ancient homeland by the Romans in the first and second centuries a.d. (A small community of Jews, however, remained in the area continuously since ancient times.) At the end of the 19th century, as Jews became the victims of violent pogroms across Russia, Jews known as Zionists began arguing that their people needed a state of their own. After the end of World War II (1939-45), when 6 million Jews were killed in the Holocaust, the idea gained wider support.
The problem was that over the previous 2,000 years, their homeland hadn’t remained empty. In the early 20th century, when large numbers of Jews began moving to the area then known as Palestine, tensions erupted with Palestinians and other Arabs who lived nearby.
Complicating matters, during World War I (1914-18), Britain made separate and conflicting promises for statehood to both Jews and Arabs.
With claims for the land still unresolved, the United Nations in 1947 voted to partition Palestine. Jews accepted the plan and the following year founded Israel. But Palestinians, who considered the deal unfair, rejected it. In 1948, Israel’s Arab neighbors attacked. Israel survived, and even gained some territory. Palestinians, on the other hand, remained stateless, with 700,000 people displaced. That set the stage for an even bigger showdown two decades later, in 1967.