Spanish Democratic Union

The party was led by former public works minister Federico Silva Muñoz until October 1976,^[5][6] when he stepped down over discrepancies with his party on the issue of forming an alliance of centre-right and conservative parties;^[7][8][9] such an alliance would materialize into the formation of the People's Alliance (AP),^[10] which Muñoz would join after splitting from the UDE.^[11][12][13]

On 4 April 1977, UDE would merge with the Christian Democratic People's Party (PPDC) into the newly formed Christian Democratic Party (PDC),^[14][15][16] which would in turn eventually merge into the Union of the Democratic Centre in December 1977,^[17] and dissolved in February 1978.^[18]