Final answer:
Iranian immigration peaked in the 1980s due to political unrest in Iran.
Step-by-step explanation:
The question is about Iranian immigration, which peaked in the 1980s. Iranian immigration to the United States increased significantly in the 1980s due to political unrest in Iran, particularly during the Iranian Revolution. Many Iranians sought better opportunities and political stability in the United States, leading to a peak in immigration during that time.