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The U.S. drone strike that killed a prominent Iranian general in Baghdad raises tensions even higher between Tehran and Washington, after months of trading attacks and threats across the wider Middle East.

How Iran will respond remains in question as well, though its supreme leader warned that a 鈥渉arsh retaliation is waiting" for those who killed Revolutionary Guard Maj. Gen. Qassem Soleimani, the head of Iran's elite Quds Force,聽early Friday morning. That could include anything, from challenging U.S. warships in the Persian Gulf, firing ballistic missiles, or deploying the asymmetrical proxy forces Iran has cultivated in the region to cover for its long-sanctioned conventional forces.聽

General Soleimani's death is the latest in a series of escalating incidents that traces back to President Donald Trump's decision in 2018 to unilaterally withdraw America from Iran's nuclear deal with world powers. However, overall enmity between Iran and the United States date back to its 1979 Islamic Revolution, as well as a 1953 U.S.-backed coup in Tehran that cemented the power of its ruling shah over an elected prime minister.

Here's where things stand now:

The general's killing

, as well as聽, and five others. The Defense Department said it killed General Soleimani as a pre-emptive attack: He 鈥渨as actively developing plans to attack American diplomats and service members in Iraq and throughout the region.鈥� It also accused General Soleimani of approving the attacks on the U.S. Embassy in Baghdad earlier this week. General聽That included overseeing forces fighting in Syria, as well as militias that targeted U.S. forces in Iraq with deadly bomb attacks after the 2003 invasion that toppled Saddam Hussein.

Months of attacks

Citing an unspecified threat from Iran, the White House in May ordered a U.S. aircraft carrier to rush to the Persian Gulf. Soon after,聽聽near the crucial Strait of Hormuz, through which 20% of all oil passes. Iran denied being involved,聽though it did seize oil tankers in response to one of its tankers being seized off Gibraltar. Iran also聽shot down a U.S. military surveillance drone. Mr. Trump pulled back from retaliating for the attack. Meanwhile, attacks on Saudi Arabia's energy industry escalated to聽a missile-and-drone strike in September temporarily halving its oil production. Israel meanwhile聽has repeatedly struck Iran-linked targets in Syria in recent years聽and has warned against any permanent Iranian presence on the frontier. The attacks culminated with American airstrikes hitting Iranian-backed militias in Iraq (provoked by the killing of a U.S. contractor) and those聽militiamen attacking the U.S. Embassy in Baghdad this week.

Iran's faltering nuclear deal

The Iranian attacks came after Mr. Trump's decision in May 2018 to withdraw America from Iran's nuclear deal with world powers. The 2015 accord saw Iran agree to limit its enrichment of uranium in exchange for the lifting of economic sanctions. Mr. Trump re-imposed American sanctions and levied even harsher ones, crippling its crucial oil industry. Iran initially proposed a policy called 鈥渟trategic patience,鈥� hoping to wait Mr. Trump out. But as聽Europe largely hasn't been able to offer Tehran聽a way around American sanctions,聽. That has included breaking enrichment, stockpile and centrifuge limitations, as well as聽. Tehran appears poised to take a new step away from the deal beginning from Sunday.

Iran's means of retaliation

Iran's conventional military force is limited. The backbone of its air power remains pre-revolution American F-4s, F-5s and F-14s, with a mix of other Soviet, French, and aging aircraft. That fleet is outgunned by the modern U.S.-supplied fighter jets flown by Israel and the Gulf Arab states. To counter that, Iran has put much of its money toward developing a ballistic missile program operated by the Guard.聽, like Iraqi militiamen, Lebanon's Hezbollah or Yemen's Houthi rebels. The U.S. has blamed car bombs and kidnappings never claimed by Iran on Tehran as well. The Guard also routinely harasses U.S. Navy vessels in Persian Gulf and surrounding waterways, while Iran has surface-to-sea missile batteries along its coast as well.

U.S.'s broad Mideast presence

The Persian Gulf hosts a series of major American military installations. The U.S. Navy鈥檚 5th Fleet, which oversees the region, is based in Bahrain, an island nation off the coast of Saudi Arabia that is home to over 7,000 American troops. Kuwait hosts more than 13,000 American troops and the U.S. Army鈥檚 Central forward headquarters. Dubai in the United Arab Emirates is the largest port of call for the U.S. Navy outside of America. The UAE hosts 5,000 U.S. military personnel, many at Abu Dhabi鈥檚 Al-Dhafra Air Base, where American drones and advanced F-35 jetfighters are stationed. The forward headquarters of the U.S. military鈥檚 Central Command is at Qatar鈥檚 sprawling Al-Udeid Air Base, home to some 10,000 American troops. In Oman, the sultanate allows thousands of overflights and hundreds of landings a year, while also granting access to ports and its bases. Meanwhile, U.S. forces are in Afghanistan, Iraq, and Syria.

The U.S. has urged its citizens to leave Iraq "immediately." The State Department said the embassy in Baghdad, which was attacked by Iran-backed militiamen and other protesters earlier this week, is closed and all consular services have been suspended.

Around 5,200 American troops are based in Iraq, where they mainly train Iraqi forces and help to combat Islamic State militants.

A history of enmity

Tensions between Iran and the U.S. trace back decades. For Iranians, they point to the 1953 CIA-backed coup that toppled Mohammad Mosaddegh and cemented the power of Shah Mohammad Reza Pahlavi. The shah served as a key U.S. ally for decades after, buying billions of dollars of weapons and allowing America to spy on the Soviet Union from his country.聽聽By 1979, the fatally ill shah fled the country. The 1979 Islamic Revolution and the hostage crisis soon followed,聽a history the two countries remain captive to until today.

This story was reported by the Associated Press.