Final answer:
The U.S. changed its public policy toward Iran by assisting in the overthrow of Prime Minister Mossadegh in 1953 and providing aid to the shah. However, as Iran became less dependent on U.S. aid and blamed the United States for the decline of Iranian democracy, public policy shifted. President Carter froze Iranian assets, placed an embargo on Iranian oil shipments, and deported Iranian students studying abroad in response to the Iranian hostage crisis in 1979.
Step-by-step explanation:
The U.S. changed its public policy toward Iran in several ways. One significant change occurred in 1953 when the United States assisted in the overthrow of Prime Minister Mohammad Mossadegh, which led to the shah's assumption of complete control of Iran's government. The U.S. also provided the shah's government with aid. However, as Iran became less dependent on U.S. aid and blamed the United States for the decline of Iranian democracy, public policy shifted. President Carter froze Iranian assets, placed an embargo on Iranian oil shipments, and deported Iranian students studying abroad. These actions were in response to the Iranian hostage crisis in 1979.