What is the cause of the situation between the United States and Iran, from intimacy to irreconcilability?

In today's world, Iran is the only one who dares to confront the United States directly, except for the regime of Saddam Hussein and the regime of Moammar Gadhafi, which has been destroyed by the United States. There are two reasons why Iran dares to confront the United States openly and directly. before introducing the reasons, let's sort out the relationship between the United States and Iran's former and current regimes from intimacy to irreconcilability.

1. During the reign of King Pahlavi

When King Pahlavi was in power, he was the most loyal lackey of Americans. It is even more iron than the current relationship between the United States and Israel. America's best weapons are only sold to Iran at a discount. For example, the FMur14 high-end fighter plane is currently only equipped by the United States and Iran. The Iranian army still retains former American-made weapons.

2. King Pahlavi was overthrown by Khomeini (Islamic Revolutionary Movement)

Pahlavi, strongly supported by the United States, was overthrown by Khomeini forces, so the two countries were hostile. There were also incidents of occupying the United States Embassy, kidnapping American diplomats and Americans working in Iran.

3. Khomeini takes the stage

Khomeini, who was oppressed by Pahlavi, was extremely anti-American after he came to power. During the Iran-Iraq war, the United States supported Iran's old enemy Iraq. Iran blocked the Gulf, fired missiles at US oil tankers, deployed mines, and injured US ships and merchant ships. Us warship sank Iranian frigate and missile speedboat. An anti-aircraft missile was fired to destroy an Iranian airliner, killing hundreds of innocent Iranian people.

4. Hatred deepens

Diplomatically, the two countries frequently fought against each other, scolded each other across the sea, and their hatred deepened step by step.

There are two reasons why Iran dares to confront the United States publicly and directly:

1. Iran is an Islamic country, and Islam is the ideological basis of Iran and occupies a dominant position.

Islam and Islamic culture have fundamental contradictions and conflicts with Western cultures such as the United States. Iran's challenge to the United States can consolidate Islam's ideological status and special skepticism at home, thereby consolidating its rule.

2. Iran was not the central birthplace of Islam.

Since Khomeini's Islamic Revolution, Iran has become the leader of the Ishran state, and it must consolidate its leadership position in the Islamic world, which is very important and has great appeal to the Islamic world. To challenge the United States means to safeguard the feelings of the sacred Islamic nation, which will be supported by many people, and this is Iran's attempt to maintain its position in the Middle East.