Answer: The Islamic Revolution under the wise leadership of Imam Khomeini emerged victorious at very sensitive juncture of history. The colonial powers had divided the world into the eastern and Western blocks.
The Western backers of the Shah regime were pursing their strategic and economic interests in the region through the Pahlavi dynasty.
The great Imam established an Islamic-democratic system following the victory of the Islamic revolution in 1979. The system was established on principals of freedom and independence.
Iranians revolution had changed the balance of power in interest of the Muslim and oppressed nations. The West and other colonial power saw the revolution as a challenge to their interests in the Mideast region.