In 1946, the Al Saada party was founded in Muhammar and demanded the independence of Khuzestan. The Iranian army took advantage of its conflicts with the Communist Party, Toudeh, to commit massacres. Later in Arabistan, new independent or autonomist parties came into being: the "Arabistan Liberation Front" in 1956; the "National Front for the Liberation of Arabistan" and the "Arab Gulf" in 1960; In 1967, the "Arabistan Liberation Front" became the "Al Ahwaz Liberation Front". Sporadic Arab insurgency in Khuzestan continued through the 1950s, but reduced in the final decade of Pahlavy rule .
Question: How many years did these events span?
Answer: 21