Starting with Sykes-Picot?
"The territory of what would become the states of Israel and Lebanon was once part of the long-lived Ottoman Empire (1299–1922) until its defeat in World War I. As a result of Sinai and Palestine Campaign in 1917, the British occupied Palestine and parts of what would become Syria.
"French troops took Damascus in 1918.
"The League of Nations officially gave the French the Mandate of Syria and the British the Mandate of Palestine after the 1920 San Remo conference, in accordance with the 1916 Sykes-Picot Agreement."
Israel declared independence in March of 1948 with the blessing of the UN.
"The largely Christian enclave of the French Mandate became the French-controlled Lebanese Republic in 1926. Lebanon became independent in 1943 as France was under German occupation, though French troops did not completely withdraw until 1946."
Israeli?Lebanese conflict - Wikipedia, the free encyclopedia