The SGP was traditionally committed to independence but collaborated locally with ARP and CHU in the 1950s until they merged into the CDA.

For the 1984 European Parliament elections, the GPV – after much internal controversy – agreed to a list combination for the first time.

In 1994, objections arose from the SGP after the RPF proposed a female candidate for the joint list for the European Parliament elections.

The SGP board then declared that participation in a joint list with a woman remained unacceptable in principle.

The RPF and GPV responded by setting rules ensuring they would not be forced to exclude women from joint lists.

Hans Blokland and Van der Waal joined Europe of Democracies and Diversities (EDD) in 1999 when the previous faction reorganized.

Due to growing disagreements, Christian Union decided in 2022 not to form a joint list in the European Parliament elections on 6 June 2024.