What was one significant an immediate cause of the six day war also known as the June war

The Six Day War - also known as the June 1967 War in Arab historiography - was a war that pitted Israel against an Arab coalition formed by the United Arab Republic - official name of Egypt at the time - Jordan, Iraq and Syria between June 5 and 10, 1967.

After the Egyptian demand to the UN to withdraw almost immediately its forces of interposition in the Sinai (UNEF), the deployment of Egyptian forces on the Israeli border and the blockade of the Straits of Tiran, Israel, fearing an imminent attack, launched a preemptive strike against the Egyptian air force. Jordan responded by attacking the Israeli cities of Jerusalem and Netanya. By the end of the war, Israel had conquered the Sinai Peninsula, the Gaza Strip, the West Bank, East Jerusalem (including the Old City) and the Golan Heights.

In 1947, the UN established a plan for the division of the British Mandate of Palestine into two states, one Jewish and one Arab, so that Jerusalem and Bethlehem were under international control. The Arab countries and the leaders of the Palestinian Arab community rejected the plan and attacked the newly created State of Israel on the day of its proclamation, which led to the Arab-Israeli war of 1948, which ended with the victory of the Israelis, its definitive independence and the expansion of the territory of Israel. For its part, Egypt appropriated the Gaza Strip and Transjordania, occupied the West Bank and part of Jerusalem (renaming the country with the name of Jordan).

The Arab countries did not accept the outcome of this war and continued with guerrilla actions against Israel, which led this country to intervene with France and the United Kingdom in the Suez War (1956). This war was a military victory, but a political defeat for the three allies, since the great diplomatic pressure on the part of the United States and the Soviet Union forced France, England and Israel to withdraw their armies. In exchange for withdrawing its armies from Sinai, Israel indirectly obtained from Egypt the commitment to stop its shipments of arms to the guerrillas fighting against Israel. As a result, relations between Egypt and Israel were reassured (to the extent that this was possible) for a time. In addition, a special body of the UN, known as UNEF for its acronym in English, was deployed in the Sinai Peninsula, to interpose between Israelis and Egyptians.

The Six Day War was a conflict that occurred in June 1967 between Israel and the state known at that time as the United Arab Republic (UAR), which was formed by Egypt, Jordan, and Syria.

The cause of the war was the refusal of the UAR to open the Straights of Tiran to Israeli ships. In the months prior to June 1967, Israeli made it clear to the UAR that this blockage would be a cause for war. Egypt maintained his position of the closure of the strait to Israel, when in May 1967, Egyptian President Gamal Abdel Nasser announced this publicly and subsequently mobilized troops to the border with Israel.