Post-independence
Arab nationalism influenced some circles who opposed the lack of modernisation by the Mutawakkilite monarchy. This became apparent when Imam Ahmad bin Yahya died in 1962. He was succeeded by his son, but army officers attempted to seize power, sparking the North Yemen Civil War. The Hamidaddin royalists were supported by Saudi Arabia, Britain, and Jordan, whilst the military rebels were backed by Egypt. The supporters of the Hamidaddin royalists mostly gave them weapons and financial aid, but some small military forces were also deployed. Egypt provided the rebels with weapons and financial assistance, but also sent a large military force to participate in the fighting. Israel covertly supplied weapons to the royalists to keep the Egyptian military busy in Yemen. After six years of civil war, the military rebels formed the Yemen Arab Republic.
The revolution in the north coincided with the Aden Emergency, which ended British rule in the south. On 30 November 1967, the state of South Yemen was formed, comprising Aden and the former Protectorate of South Arabia. This socialist state was later officially known as the People's Democratic Republic of Yemen and a programme of nationalisation was begun.
Relations between the two Yemeni states fluctuated between peaceful and hostile. The South was supported by the Eastern Bloc. The North was unable to get similar connections. In 1972, the two states fought a war. The war was resolved with a ceasefire and negotiations were brokered by the Arab League, where it was declared that unification would eventually occur. In 1978, Ali Abdullah Saleh was named as president of the Yemen Arab Republic. After the war, the North complained about the South's help from foreign countries including Saudi Arabia.
In 1979, fighting between the two states resumed and unification efforts renewed. Thousands were killed in the South Yemen Civil War, in 1986. President Ali Nasser Muhammad fled to the north and was sentenced to death for treason. A new government formed.
In 1990, the two governments reached a full agreement on the joint governing of Yemen, and the countries were merged on 22 May 1990, with Saleh as president. The president of South Yemen, Ali Salem al-Beidh, became vice president. A unified parliament was formed and a unity constitution was agreed upon. In the 1993 parliamentary election, the first held after unification, the General People's Congress won 122 of 301 seats.
After the invasion of Kuwait crisis in 1990, Yemen's president opposed military intervention from non-Arab states. As a member of the United Nations Security Council for 1990 and 1991, Yemen abstained on a number of UNSC resolutions concerning Iraq and Kuwait and voted against the "...use of force resolution." The vote outraged the U.S., and Saudi Arabia expelled 800,000 Yemenis in 1990 and 1991 to punish Yemen for its opposition to the intervention.
In the absence of strong state institutions, elite politics in Yemen constituted a de facto form of collaborative governance, where competing tribal, regional, religious, and political interests agreed to hold themselves in check through tacit acceptance of the balance it produced. The informal political settlement was held together by a power-sharing deal among three men: President Saleh, who controlled the state; major general Ali Mohsen al-Ahmar, who controlled the largest share of the Yemeni Armed Forces; and Abdullah ibn Husayn al-Ahmar, figurehead of the Islamist al-Islah party and Saudi Arabia's chosen broker of transnational patronage payments to various political players, including tribal sheikhs. The Saudi payments have been intended to facilitate the tribes' autonomy from the Yemeni government and to give the Saudi government a mechanism with which to weigh in on Yemen's political decision-making.
Following food riots in major towns in 1992, a new coalition government made up of the ruling parties from both the former Yemeni states was formed in 1993. However, Vice President al-Beidh withdrew to Aden in August 1993 and said he would not return to the government until his grievances were addressed. These included northern violence against his Yemeni Socialist Party, as well as the economic marginalisation of the south. Negotiations to end the political deadlock dragged on into 1994. The government of Prime Minister Haydar Abu Bakr Al-Attas became ineffective due to political infighting.
An accord between northern and southern leaders was signed in Amman, Jordan on 20 February 1994, but this could not stop the civil war. During these tensions, both the northern and southern armies (which had never integrated) gathered on their respective frontiers.
Ali Abdullah Saleh became Yemen's first directly elected president in the 1999 presidential election, winning 96% of the vote. The only other candidate, Najeeb Qahtan Al-Sha'abi, was the son of Qahtan Muhammad al-Sha'abi, a former president of South Yemen. Though a member of Saleh's General People's Congress (GPC) party, Najeeb ran as an independent.
After the September 11 attacks on the United States, President Saleh assured U.S. President George W. Bush that Yemen was a partner in his war on terror. In 2001, violence surrounded a referendum, which apparently supported extending Saleh's rule and powers.
The Houthi insurgency in Yemen began in June 2004, when cleric Hussein Badreddin al-Houthi, head of the Zaydi sect, launched an uprising against the government. The Yemeni government said that the Houthis were seeking to overthrow it and to implement Shia law. The rebels countered that they were defending against Shia persecution and government aggression. In 2005, at least 36 people were killed in clashes across the country between police and protesters over rising fuel prices. In the 2006 presidential election, Saleh won with 77% of the vote. His main rival, Faisal bin Shamlan, received 22%. Saleh was sworn in for another term on 27 September.
A series of bomb attacks occurred on police, official, diplomatic, foreign business, and tourism targets in 2008. In 2008, an opposition rally in Sanaa demanding electoral reform was met with police gunfire.
The 2011 Yemeni revolution followed other Arab Spring mass protests in early 2011. The uprising was initially against unemployment, economic conditions, and corruption, as well as against the government's proposals to modify the constitution of Yemen so that Saleh's son could inherit the presidency.
In March 2011, police snipers opened fire on a pro-democracy camp in Sanaa, killing more than 50 people. In May, dozens were killed in clashes between troops and tribal fighters in Sanaa. By this point, Saleh began to lose international support. In October 2011, Yemeni human rights activist Tawakul Karman won the Nobel Peace Prize, and the UN Security Council condemned the violence and called for a transfer of power. On 23 November 2011, Saleh flew to Riyadh, in neighbouring Saudi Arabia, to sign the Gulf Co-operation Council plan for political transition, which he had previously spurned. Upon signing the document, he agreed to legally transfer the office and powers of the presidency to his deputy, Vice President Abdrabbuh Mansur Hadi.
Hadi took office for a two-year term upon winning the uncontested presidential elections in February 2012. A unity government—including a prime minister from the opposition—was formed. Al-Hadi would oversee the drafting of a new constitution, followed by parliamentary and presidential elections in 2014. Saleh returned in February 2012. In the face of objections from thousands of street protesters, parliament granted him full immunity from prosecution. Saleh's son, General Ahmed Ali Abdullah Saleh, continues to exercise a strong hold on sections of the military and security forces.
By 2012, there was a "small contingent of U.S. special-operations troops"—in addition to CIA and "unofficially acknowledged" U.S. military presence—in response to increasing terror attacks by AQAP on Yemeni citizens. Many analysts have pointed out the former Yemeni government role in cultivating terrorist activity in the country. Following the election of President Abdrabbuh Mansur Hadi, the Yemeni military was able to push Ansar al-Sharia back and recapture the Shabwah Governorate.
The central government in Sanaa remained weak, staving off challenges from southern separatists and Houthis as well as AQAP. The Houthi insurgency intensified after Hadi took power, escalating in September 2014 as anti-government forces led by Abdul-Malik al-Houthi swept into the capital and forced Hadi to agree to a "unity" government. The Houthis then refused to participate in the government, although they continued to apply pressure on Hadi and his ministers, even shelling the president's private residence and placing him under house arrest, until the government's mass resignation in January 2015. The following month, the Houthis dissolved parliament and declared that a Revolutionary Committee under Mohammed Ali al-Houthi was the interim authority in Yemen. Abdul-Malik al-Houthi, a cousin of the acting president, called the takeover a "glorious revolution". However, the "constitutional declaration" of 6 February 2015 was widely rejected by opposition politicians and foreign governments, including the United Nations.
Hadi managed to flee from Sanaa to Aden, his hometown and stronghold in the south, on 21 February 2015. He promptly gave a televised speech rescinding his resignation, condemning the coup, and calling for recognition as the constitutional president of Yemen. The following month, Hadi declared Aden Yemen's "temporary" capital. The Houthis, however, rebuffed an initiative by the Gulf Cooperation Council and continued to move south toward Aden. All U.S. personnel were evacuated, and President Hadi was forced to flee the country to Saudi Arabia. On 26 March 2015, Saudi Arabia announced Operation Decisive Storm and began airstrikes and announced its intentions to lead a military coalition against the Houthis, who they claimed were being aided by Iran and began a force buildup along the Yemeni border. The coalition included the United Arab Emirates, Kuwait, Qatar, Bahrain, Jordan, Morocco, Sudan, Egypt, and Pakistan. The United States announced that it was assisting with intelligence, targeting, and logistics. After Hadi troops took control of Aden from Houthis, jihadist groups became active in the city, and some terrorist incidents were linked to them such as Missionaries of Charity attack in Aden on 4 March 2016. In February 2018, Aden was seized by the UAE-backed separatist Southern Transitional Council.
Yemen has been suffering from a famine since 2016 as a result of the civil war. More than 50,000 children in Yemen died from starvation in 2017. Numerous commentators have condemned the Saudi-led coalition's military campaign, including its blockade of Yemen, as genocide. The famine is being compounded by an outbreak of cholera that has affected more than one million people. The Saudi Arabian-led intervention in Yemen and blockade of Yemen have contributed to the famine and cholera epidemic. The UN estimated that by the end of 2021, the war in Yemen would have caused over 377,000 deaths, and roughly 70% of deaths were children under age 5.
On 4 December 2017, deposed strongman and former president Ali Abdullah Saleh, accused of treason, was assassinated by Houthis whilst attempting to flee clashes near rebel-held Sanaa between Houthi and pro-Saleh forces. After losing the support of the Saudi-led coalition, Yemen's President Abd Rabbuh Mansur Hadi resigned, and the Presidential Leadership Council took power in April 2022.
Following the outbreak of the Gaza war, the Houthis began to fire missiles at Israel and attack ships off Yemen's coast in the Red Sea. This was in solidarity with the Palestinians and aiming to facilitate entry of humanitarian aid into the Gaza Strip.
In June 2024, the UAE-backed STC were putting pressure to lease the Aden International Port to Abu Dhabi Ports. The move was opposed by the Parliament and the public. A joint statement by 24 members of Shura Council expressed categorical rejection of the lease agreement. Economists said the Emirates was attempting to control the Aden Port and limit its activities, in order to keep its own ports active. Governor of Aden, Tariq Salam also said the lease attempt aims to devalue the Aden Port and take its international maritime status. Aden International Port had ended its agreement to manage two container terminals with Dubai Ports World in 2012, due to economic decline and failure to fulfil commitments.
Despite the STC embarking on an initially successful military campaign in late 2025, it was decisively defeated in early 2026 by a Yemeni government counter-offensive.
