The revolution in Iran was not about Iraq, but about internal Iranian problems.
The Shatt al-Arab and its Iranian counterpart known as Khuzestan were the main pieces of land disputed between Iran and Iraq.
Iraq as an independent nation (since 1923) has never successfully taken over Iran. Iraq's incursions into Iranian territory during the first part of the Iran-Iraq War (1980-1982) occupied less than 5% of Iranian territory. However, there have been empires based in Iraq that have conquered Iran such as the Abbassid Caliphate and Ilkhanate in the 800s-1300s.
Iranian PerspectiveUS and England were angry because of Iran's revolution as it was not profitable for them anymore. So they gave Saddam equipments to start that war and Iran defended their country with no equipment but courage. When they were winning they were forced to sign ceasefire.International Affairs PerspectiveThe Iran-Iraq War reflected a change in military and strategic alliances in the Persian Gulf Region. The British and the Americans had previously had a strong relationship with the Shah of Iran and buttressed his government against Arab powers such as Iraq. With the Islamic Revolution, Iran vehemently opposed American and British interests and as a result, the Americans and British buttressed Iraq instead. The blessing these powers gave to Saddam Hussein of Iraq to attempt to conquer Iran (or at least the oil-rich Arab Iranian province of Khuzestan) set the war into motion. The resulting war permanently (until Saddam Hussein's overthrow) set Iran and Iraq against each other, lessening Iranian influence in the Middle East. In addition, as the two countries were about evenly matched (even with all of the foreign investment) their stalemate effectively quelled fears of Iranian culture and Shiite Islamism from penetrating the Arab World and Ba'athism from penetrating Iran. Since 2003, and the fall of Iraq, Islamism and Iranian influence have begun to strongly shape Arab discourse.
Iraq: Yes. The Tigris and Euphrates are affected by the Southeastern Anatolia project. Iran: No. There is no major Iranian river that has sources in Turkey.
SAVAK was the Iranian Secret Police under the Shah of Iran. Shiites are the sect of Islam that is dominant in Iran, Iraq, and Azerbaijan.
Iraq invaded in Iran in 1980. This was done since Iraq wished to annex the oil-rich Iranian Arab province of Khuzestan (Ahwaz in Arabic). As Iran was recovering from the Islamic Revolution, Iraqi leadership figured that it would be easier to defeat.
Iraq was trying to acquire the oil-rich Iranian province of Khuzestan which has an Arab ethnic majority. Iran invaded Iraq in response with no particular piece of land in mind.
The United States sided with Iraq instead of Iran because the Iranian Revolution of February 11, 1979 had just deposed the US installed puppet-dictator, Mohamed Reza Shah, effectively cutting-off US control of Iran and its abundant oil resources. However, one must remember that money was made by US defense contractors arming the two sides as they brutally killed one another for the decade long war.
The Iran-Iraq War started when Saddam Hussein ordered the Iraqi Army to march into Khuzestan, a southwestern Iranian province on September 22, 1980.
There are around 6.5–7.9 million Kurds in Iran and 6.2–6.5 million Kurds in Iraq, so there are more Kurds in Iran. However, as the Iranian population overall is significantly larger, Kurds make up a more significant percentage of the population in Iraq.
If this is a reference to possible future Israeli-Iranian Conflict or the future American-Iranian Conflict, it is far more likely that the non-Iranian side will strike first. This is since the non-Iranian nations want to preserve a non-nuclear Iran, which may require more immediate action than Iran's current interests which typically involve funding proxies for its control of the Middle East (like Hezbollah and the Syrian government). If this is a reference to the Iran-Iraq War of 1980-1988, Iraq fired the opening shot.