Following the expiration of The British Mandate for Palestine, the Kingdom of Egypt, Transjordan, Lebanon, Syria, Iraq and Saudi Arabia invade Israel thus starting the 1948 Arab–Israeli War.

Mandatory Palestine was a British geopolitical entity that existed between 1920 and 1948 in the region of Palestine, and after 1922, under the terms of the League of Nations' Mandate for Palestine.

The Kingdom of Egypt was the legal form of the Egyptian state during the latter period of the Muhammad Ali dynasty's reign, from the United Kingdom's recognition of Egyptian independence in 1922 until the abolition of the monarchy of Egypt and the Sudan in 1953 following the Egyptian Revolution of 1952. Until the Anglo-Egyptian treaty of 1936, the Kingdom was only nominally independent, as the United Kingdom retained control of foreign relations, communications, the military, and the Anglo-Egyptian Sudan. Officially, the Sudan was governed as a condominium of the two states; however, in reality, true power in the Sudan lay with the United Kingdom. Between 1936 and 1952, the United Kingdom continued to maintain its military presence, and its political advisers, at a reduced level.

Jordan, officially the Hashemite Kingdom of Jordan, is a country in the Southern Levant region of West Asia. Jordan is bordered by Syria to the north, Iraq to the east, Saudi Arabia to the south, and Israel and the occupied Palestinian territories to the west. The Jordan River, flowing into the Dead Sea, is located along the country's western border within the Jordan Rift Valley. Jordan has a small coastline along the Red Sea in its southwest, separated by the Gulf of Aqaba from Egypt. Amman is the country's capital and largest city, as well as the most populous city in the Levant.

Lebanon, officially the Republic of Lebanon, is a country in the Levant region of West Asia. Situated at the crossroads of the Mediterranean Basin and the Arabian Peninsula, it is bordered by Syria to the north and east, Israel to the south, and the Mediterranean Sea to the west; Cyprus lies a short distance from the coastline. Lebanon has a population of more than five million and an area of 10,452 square kilometres (4,036 sq mi). Beirut is the country's capital and largest city.