The coalition, in fact a federation of parties, was formed on 3 May 1977, during the transition to democracy from the dictatorship of
Francisco Franco, with the involvement of leaders from a variety of newly formed centrist and rightist factions, under the leadership of Suárez, then
Prime Minister. The principal components of the UCD defined themselves as
social democrats, or “independents,” the latter frequently comprising
conservative elements which had been part of the Franco regime.
The parties that made the UCD coalition were:
- Regional parties:
Extremaduran Regional Action (AREX) of
Enrique Sánchez de León.
Independent Galician Party (PGI) of
José Luis Meilán.
Andalusian Social Liberal Party (PSLA) of
Canarian Union (UC) of
Murcian Democratic Union (UDM) of
Antonio Pérez Crespo.
- Later the
Independent Social Federation (FSI) of
Jesús Sancho Rof was also added to the coalition.
Some months later, all these parties were merged and UCD constituted itself as a party on 4 August 1977.
The UCD governed Spain to 1982. In the
elections of 15 June 1977, the party took 34.4% of the vote and 166 seats of the 350 in the
Congress of Deputies. The party governed as a minority and worked with all major parties in the Congress, including the rightist People’s Alliance and the parties of the left, the
Spanish Socialist Workers' Party (PSOE) and
Communists (PCE). Suárez became the first democratically chosen prime minister of Spain after the Franco period. The UCD played a major role in writing the new
constitution, as three of the seven members of the constitutional drafting commission, established after those elections, came from the party. In March 1979 the UCD again won the
elections but could not attain a majority, with 34.8% of the vote and 168 deputies.
The demise of the UCD began when in 1979 the Socialist Party moderated their outlook by dropping the references to Marxism from their programme. At the same time, the right-wing
People's Alliance increasingly oriented to the political centre and, by undergoing a generation change, could overcome their
Francoist image. Therefore, the space for the centrist UCD shrank.
The fundamental reason for the party’s disappearance was internal conflict between its diverse factions, which led to the resignation of Suárez as prime minister in January 1981. Suárez was replaced by
Leopoldo Calvo Sotelo for the remainder of the term of the
Cortes. Many believe that the only factor that had kept the party together was the writing of the constitution. With that work done, the party became increasingly unpopular due to the growth of unemployment, inflation and the general economic crisis affecting the country.
Splits and defections 1980-1982
During the course of the 1979-1982 legislature the party suffered a number of serious splits and defections. On 7 March 1980,
Joaquim Molins resigned from the UCD group and later joined the Catalan Nationalist
Convergence and Union. On 25 April 1980,
Manuel Clavero resigned from the party in disputes over the statute of autonomy for Andalusia. Two months later,
José García Pérez resigned over the same issue. García joined the
Andalusian Socialist Party on 1 September 1981.
On 10 November 1981
Manuel Díaz-Piniés resigned from the party and 1 February 1982 he, together with three other deputies
Miguel Herrero de Miñón,
Ricardo de la Cierva and
Francisco Soler Valero joined the
Popular Alliance (AP). The first of a number of breakaway parties emerged three days later on 4 February 1982 when 10 UCD deputies from the left of the party -
Francisco Fernández Ordóñez,
Antonio Alfonso Quirós,
Carmela García Moreno,
Ciriaco Díaz Porras,
Luis González Seara,
María Dolores Pelayo and
Carmen Solano formed the
Democratic Action Party (Partido de Acción Democrática/PAD). This group stood as part of the PSOE list in the 1982 election and merged with the PSOE in January 1983.
In Summer 1982 the party splintered further. Two deputies
Modesto Fraile and
Carlos Gila quit the party and in August they along with 11 other UCD deputies (
María Josefa Lafuente,
José Luis Moreno,
José Manuel Otero,
José Pin Arboledas,
José Luis Ruiz Navarro and
Luis Vega) formed the
People's Democratic Party (PDP). This party allied itself with the AP for the 1982 election.
Also in August, 16 deputies, headed by the former leader and Prime Minister Adolfo Suarez formed the
Democratic and Social Centre (CDS).
 Among the founding members were deputies such as
Agustín Rodríguez Sahagún,
Rafael Calvo Ortega,
José María Mesa,
José Javier Rodríguez Alcaide and
Manuel de Sàrraga and
Alejandro Rebollo Álvarez-Amandi. The CDS fought the 1982 election in direct competition with the UCD.
Although the UCD had been joined by
José María de Areilza and
Antoni de Senillosa, who had defected from the AP, the UCD party group had now been reduced to 124 deputies - 52 short of a majority. The PSOE at this point had 118 deputies and could also count on the support of the 10 deputies of the PAD and the 21 members of the Communist Party. In light of this new situation in Parliament, Calvo Sotelo called fresh elections.
1982 election and disbanding
Following the attempted coup of
1981, the socialists convincingly won the
1982 general election. The UCD, presenting
Landelino Lavilla as its candidate for prime minister, was nearly wiped out, taking only 6.7% of the vote and 11 seats, losing over 100 of their sitting deputies—one of the worst defeats ever suffered by a western European governing party. The CDS also fared poorly, with only two of its sixteen sitting deputies winning seats.
Most of the UCD’s electorate became supporters of the AP-PDP alliance, which later became the
People's Party, today Spain's principal conservative party. The AP-PDP displaced the UCD as the main alternative to the PSOE.
Many ex-ministers and leaders of UCD also joined the AP ranks. Subsequently, the UCD was disbanded on 18 February 1983.