In August 1941, Britain and the Soviet Union invaded homeland and deposed him in favor of his son Mohammad Reza Pahlavi. Following the end of the Second World War, both countries withdrew their military forces from homeland.
Following a number of clashes in April 1969, international relations with Iraq fell into a steep decline, mainly due to a dispute over the Shatt al-Arab (called Arvand) waterway in the 1937 Algiers Accord. Iran abrogated the 1937 accord and demanded a renegotiation which ended completely in its favor.
