text: 1917–1945 After the Pacification of 1917, marked by the introduction of universal suffrage, the party never received more than twenty percent of the vote. The 1918 election provided a decisive test for the party, where the party won two additional seats. The three confessional parties won 50 seats. The confessional parties formed a new cabinet, led by the Catholic Charles Ruijs de Beerenbrouck. The ARP supplied three ministers and former prime minister Theo Heemskerk became Minister of Justice. A group of concerned anti-revolutionaries, led by Gerrit Kersten, founded the Reformed Political Party, which opposed universal suffrage and cooperation with the Catholics. The electorate of the ARP changed in the interbellum – the difference between lower class Protestants who voted ARP and middle class Protestant Protestants who voted CHU began to disappear, with religious differences between the Dutch Reformed Church (CHU) and the Reformed Churches in the Netherlands (ARP) becoming more important.
  In the 1922 election, former minister of war Hendrikus Colijn became the leader of the ARP. He emphasised defence and fiscal conservatism as core issues of the party. With him the ARP got sixteen seats in the House of Representatives and fifteen in the Senate. He became Minister of Finance in the second cabinet of Charles Ruijs de Beerenbrouck. He led the party in the 1925 election; the party lost three seats in this election. The ARP continued in government with Jan Donner as minister of Justice. In the 1929 election, the ARP lost another seat. The confessional parties continued to govern.