The party was founded as the
Social Democrat Radical Party () on 18 August 1994 out of a union between the
Radical Party and the
Social Democracy Party, both of which had received poor results in the parliamentary elections. The party re-adopted its historic name in 2018. The party supported
Ricardo Lagos in the
1999–2000 presidential elections, who won 48.0% in the first round and was elected with 51.3% in the second round. At the
2001 legislative elections, the party won as part of the
Concertación six out of 120 seats in the Chamber of Deputies and no seats in the Senate. This changed at the
2005 legislative elections to seven and one, respectively. In
2009, it won five congress seats and one senate seat. == Executive board ==