The modern history of Syria begins with the termination of Ottoman control of Syria by French forces and the establishment of the Occupied Enemy Territory Administration during World War I. The short-lived Arab Kingdom of Syria emerged in 1920, which was however soon committed under the French Mandate, which produced the short-lived autonomous State of Aleppo, State of Damascus (later State of Syria), Alawite State and Jabal al-Druze (state); the autonomies were transformed into the Mandatory Syrian Republic in 1930. Syrian Republic gained independence in April 1946. The Republic took part in the Arab–Israeli War and remained in a state of political instability during the 1950s and 1960s.

The 8 March 1963 coup resulted in the installation of the National Council for the Revolutionary Command (NCRC), a group of military and civilian officials who assumed control of all executive and legislative authority. The takeover was engineered by members of the Ba'ath Party led by Michel Aflaq and Salah al-Din al-Bitar. He was overthrown in early 1966 by Marxist–Leninist military dissidents of the party led by General Salah Jadid. After the Arab Spring of 2011, Bashar al-Assad's government was embroiled in the ongoing Syrian civil war.

On 8 December 2024, Bashar al-Assad fled to Russia after rebels seized the capital city of Damascus, resulting in the fall of the Assad regime and establishment of a caretaker government. Following the fall of the Assad regime, Syria entered a political transition under a transitional government on 29 March 2025, headed by president Ahmed al-Sharaa.

Syria under the Mandate OETA The Occupied Enemy Territory Administration (OETA) was a joint British and French military administration over Levantine and Mesopotamian provinces of the former Ottoman Empire between 1918 and 1920, set up following the Sinai and Palestine Campaign of World War I. The administration ended following the assignment of the Mandate for Syria and the Lebanon and British Mandate for Palestine at the 19–26 April 1920 San Remo conference.

Initial civil administration Following the San Remo conference in April 1920 and the defeat of King Faisal's short-lived monarchy in Syria at the Battle of Maysalun on 24 July 1920, the French general Henri Gouraud established civil administration in the territory. The mandate region was subdivided into six states. They were the states of Damascus (1920), Aleppo (1920), Alawites (1920), Jabal Druze (1921), the autonomous Sanjak of Alexandretta (1921) (modern-day Hatay), and the State of Greater Lebanon (1920), which later became the modern country of Lebanon.

The drawing of those states was based in part on the sectarian make-up on the ground in Syria. However, nearly all the Syrian sects were hostile to the French mandate and to the division it created. This was best demonstrated by the numerous revolts that the French encountered in all of the Syrian states. Maronite Christians of Mount Lebanon, on the other hand, were a community with a dream of independence that was being realized under the French; therefore, Greater Lebanon was the exception to the newly formed states.

Syrian Federation (1922-24)

In July 1922, France established a loose federation between three of the states: Damascus, Aleppo, and the Alawite state under the name of the Syrian Federation (Fédération syrienne). Jabal Druze, Sanjak of Alexandretta, and Greater Lebanon were not parts of this federation, which adopted a new federal flag (green-white-green with French canton). On 1 December 1924, the Alawite state seceded from the federation when the states of Aleppo and Damascus were united into the State of Syria.

The Great Syrian Revolt In 1925, a revolt in Jabal Druze led by Sultan Pasha al-Atrash spread to other Syrian states and became a general rebellion in Syria. France tried to retaliate by having the parliament of Aleppo declare secession from the union with Damascus, but the voting was foiled by Syrian patriots.

First Syrian Republic

The red stars that represented the three districts of the republic (Damascus, Aleppo, and Deir ez Zor).

1936 Independence treaty In 1936, the Franco-Syrian Treaty of Independence was signed, a treaty that would not be ratified by the French legislature. However, the treaty allowed Jabal Druze, the Alawite (now called Latakia), and Alexandretta to be incorporated into the Syrian republic within the following two years. Greater Lebanon (now the Lebanese Republic) was the only state that did not join the Syrian Republic. Hashim al-Atassi, who was Prime Minister under King Faisal's brief reign (1918–1920), was the first president to be elected under a new constitution adopted after the independence treaty.

Separation of Hatay

In September 1938, France again separated the Syrian district of Alexandretta and transformed it into the Republic of Hatay. The Republic of Hatay joined Turkey in the following year, in June 1939. Syria did not recognize the incorporation of Hatay into Turkey and the issue is still disputed until the present time.

World War II and the founding of the UN

With the fall of France in 1940 during World War II, Syria came under the control of the Vichy Government until the British and Free French invaded and occupied the country in July 1941. Syria proclaimed its independence again in 1941 but it was not until 1 January 1944 that it was recognized as an independent republic.

On 27 September 1941, France proclaimed, by virtue of, and within the framework of the Mandate, the independence and sovereignty of the Syrian State. The proclamation said "the independence and sovereignty of Syria and Lebanon will not affect the juridical situation as it results from the Mandate Act. Indeed, this situation could be changed only with the agreement of the Council of the League of Nations, with the consent of the Government of the United States, a signatory of the Franco-American Convention of 4 April 1924, and only after the conclusion between the French Government and the Syrian and Lebanese Governments of treaties duly ratified in accordance with the laws of the French Republic.See Foreign relations of the United States diplomatic papers, 1941. The British Commonwealth; the Near East and Africa Volume III (1941), pages 809-810; and Statement of General de Gaulle of 29 November 1941, concerning the Mandate for Syria and Lebanon, Marjorie M. Whiteman, Digest of International Law, vol. 1 (Washington, D.C.: U. S. Government Printing Office, 1963) 680-681

Benqt Broms said that it was important to note that there were several founding members of the United Nations whose statehood was doubtful at the time of the San Francisco Conference and that the Government of France still considered Syria and Lebanon to be mandates.See International law: achievements and prospects, by Mohammed Bedjaoui, UNESCO, Martinus Nijhoff; 1991, , page 46

Duncan Hall said "Thus, the Syrian mandate may be said to have been terminated without any formal action on the part of the League or its successor. The mandate was terminated by the declaration of the mandatory power, and of the new states themselves, of their independence, followed by a process of piecemeal unconditional recognition by other powers, culminating in formal admission to the United Nations. Article 78 of the Charter ended the status of tutelage for any member state: 'The trusteeship system shall not apply to territories which have become Members of the United Nations, relationship among which shall be based on respect for the principle of sovereign equality.'"Mandates, Dependencies and Trusteeship, by H. Duncan Hall, Carnegie Endowment, 1948, pages 265-266

On 29 May 1945, France bombed Damascus and tried to arrest its democratically elected leaders. While French planes were bombing Damascus, Prime Minister Faris al-Khoury was at the founding conference of the United Nations in San Francisco, presenting Syria's claim for independence from the French Mandate. Continuing pressure from Syrian nationalist groups and British pressure forced the French to evacuate their last troops on 17 April 1946.

Syrian Republic (1946–1963)

Syrian independence was acquired in 1946. Although rapid economic development followed the declaration of independence, Syrian politics from independence through the late 1960s was marked by upheaval. The early years of independence were marked by political instability.

In 1948, Syria was involved in the Arab–Israeli War with the newly created State of Israel. The Syrian army was pressed out of the Israeli areas, but fortified their strongholds on the Golan and managed to keep their old borders and occupy some additional territory. In July 1949, Syria was the last Arab country to sign an armistice agreement with Israel.

In March 1949, Syria's national government was overthrown by a military coup d'état led by Husni al-Zaim in a coup. Some authors claim involvement by the United States CIA.

Later that year Zaim was overthrown by his colleague Sami al-Hinnawi and Adib al-Shishakli. The latter undermined civilian rule and led to Shishakli's complete seizure of power in 1951. Shishakli continued to rule the country until 1955, when growing public opposition forced him to resign and leave the country. The national government was restored, but again to face instability, this time from abroad. After the overthrow of President Shishakli in a 1954 coup, continued political maneuvering supported by competing factions in the military eventually brought Arab nationalist and socialist elements to power. Between 1946 and 1956, Syria had 20 different cabinets and drafted four separate constitutions.

During the Suez Crisis of 1956, after the invasion of the Sinai Peninsula by Israeli troops, and the intervention of British and French troops, martial law was declared in Syria. Later Syrian and Iraqi troops were brought into Jordan to prevent a possible Israeli invasion. The November 1956 attacks on Iraqi pipelines were in retaliation for Iraq's acceptance into the Baghdad Pact. In early 1957 Iraq advised Egypt and Syria against a conceivable takeover of Jordan.

In November 1956 Syria signed a pact with the Soviet Union, providing a foothold for communist influence within the government in exchange for planes, tanks, and other military equipment being sent to Syria. This increase in the strength of Syrian military technology worried Turkey, as it seemed feasible that Syria might attempt to retake Iskenderon, a formerly Syrian city now in Turkey. On the other hand, Syria and the USSR accused Turkey of amassing its troops at the Syrian border. During this standoff, communists gained more control over the Syrian government and military. Only heated debates in the United Nations (of which Syria was an original member) lessened the threat of war.

Syria's political instability during the years after the 1954 coup, the parallelism of Syrian and Egyptian policies, and the appeal of Egyptian President Gamal Abdal Nasser's leadership in the wake of the Suez crisis created support in Syria for union with Egypt. On 1 February 1958, Syrian president Shukri al-Kuwatli and Nasser announced the merging of the two countries, creating the United Arab Republic, and all Syrian political parties, as well as the Communists therein, ceased overt activities.