Arabia". Boundaries with Transjordan, Mandatory Iraq, and Kuwait were established by a series of treaties negotiated in the 1920s, with two "neutral zones" created, one with Iraq and the other with Kuwait. The country's southern boundary with Yemen was partially defined by the 1934 Treaty of Ta'if, which ended a brief border war between the two states. Modern history Abdulaziz's military and political successes were not mirrored economically until vast reserves of oil were discovered in 1938 in the Al-Hasa region, along the Persian Gulf coast. Development began in 1941 and by 1949, production was in full swing. In February 1945, King Abdul Aziz met President Franklin D. Roosevelt aboard the USS Quincy in the Suez Canal. A historic handshake agreeing on supplying oil to the United States in exchange for guaranteed protection to the Saudi regime is still in force today. It has survived seven Saudi kings and twelve US presidents. Abdulaziz died in 1953. King Saud succeeded to the throne on his father's death in 1953. Oil provided Saudi Arabia with economic prosperity and a great deal of political leverage in the international community. At the same time, the government became increasingly wasteful and lavish. Despite the new wealth, extravagant spending led to governmental deficits and foreign borrowing in the 1950s. However, by the early 1960s, an intense rivalry between the King and his half-brother, Prince Faisal, emerged, fueled by doubts in the royal family over Saud's competence. As a consequence, Saud was deposed in favor of Faisal in 1964. The mid-1960s saw external pressures generated by Saudi-Egyptian differences over Yemen. When civil war broke out in 1962 between Yemeni royalists and republicans, Egyptian forces entered Yemen to support the new republican government, while Saudi Arabia backed the royalists. It is estimated that between 1962 and 1970, the monarchy in Saudi Arabia faced one of the gravest threats to its survival from Yemen. Meanwhile, Ahmad Shukeiri was relieved from his post as representative of Saudi Arabia at the UN after praising the fascist far-right organization Tacuara, and this embarrassed Arabs and caused Latin American objections. Days before his dismissal, Hutchinson News reported that Arab diplomats, who claimed to be in close touch with the Saudi Arabian government, became so annoyed at Shukairy for his rash speech that they spoke of urging Saudi Prince Faisal to recall him. This case was not the first time they disapproved of his