Answer:
Anglo-Soviet invasion of Iran in 1941, Iranian Revolution in 1979, Iran–Iraq War in 1980, execution of political prisoners in 1988
Step-by-step explanation:
The Anglo-Soviet invasion of Iran was the joint invasion of neutral Imperial State of Iran and the United Kingdom against Soviet Union in August 1941.
The Iranian Revolution locally known as the Islamic Revolution happened in 1979.
In 1980 Iraq invaded Iran, which was the beginning of the Iran–Iraq War. These events force the Iranian government to started negotiations with the United states of America.
In 1988, the execution of political prisoners across Iran starting on 19 July 1988.