In an anniversary celebration in Tehran on Monday, Iranian President Hassan Rouhani took his own defiant stand against the United States, CNN reported. However, analysts say Iran's push to back militants in the wider Mideast and Saudi Arabia's efforts to mobilize the Sunni world against the Shiite power would turn many away.
The 10-day period from the return of Imam Khomeini until the revolution's victory is celebrated annually in Iran, and is known as the Ten-Day Fajr (Dawn).
The European Union has also criticized Iran over its "destabilizing" ballistic-missile program, its "hostile activities" in several EU member states, and its meddling in countries in the Middle East. It later broadcast footage showing crowds across the country of 80 million.
Iranian people gather during a ceremony to mark the 40th anniversary of the Islamic Revolution in Tehran, Iran February 11, 2019. 40 Years of Failure to adjust U.S. policy to reality.
State TV showed crowds defying rainy weather and carrying Iranian flags while shouting anti-Israeli and anti-US slogans.
Elsewhere, the head of the elite Quds Force of Iran's powerful Revolutionary Guard, Gen. Qassem Soleimani, attended the rally in the southern city of Kerman.
The large turnout in state-sponsored rallies, in which US and Israeli flags were burned, came as Iranians face mounting economic hardships many blame on the country's clerical leaders.
Waving Iranian flags, chanting "Death to America" and burning USA and Israeli flags, hundreds of thousands of people poured out onto the streets across Iran on Monday, marking the date that's considered victory day in the country's 1979 Islamic Revolution.More news: Two Sydney men charged over Australia and America's biggest-ever ice bust
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Iranian women hold up portraits of Iranian Supreme Leader Ayatollah Ali Khamenei, during a rally marking the 40th anniversary of the 1979 Islamic Revolution, in Tehran, Iran, Monday, Feb. 11, 2019.
He told Iranians that the Shah cared mostly about rich people and let the country's secret police carry out abuses.
In January, Mr Rouhani said Iran was facing its worst economic crisis since the Shah was toppled.
Banners held by marchers or hung along the streets bore slogans including "Death to America", "Death to Israel", "we will trample on America", "forty years of challenge, forty years of USA defeats".
Former public servant Saaghi insisted that it remained paramount for Iranians to stick by the revolution.
He compared the United States sanctions and economic hardships to "riding a bicycle when someone puts a stick in the wheels" but pointed to advances in other fields as more than making up for them.
Citing leaked Iranian Judiciary documents, the Paris-based media watchdog also said that the authorities had arrested, imprisoned, or executed at least 860 journalists in the three decades between the 1979 revolution and 2009. He said he wanted to teach his son to support the revolution.