Political Catholicism is a political and cultural conception which promotes the ideas and social teaching of the Catholic Church (Catholic social teaching) in public life through government action.
According to the United States Conference of Catholic Bishops, "the separation of church and state does not require division between belief and public action, between moral principles and political choices, but protects the right of believers and religious groups to practice their faith and act on their values in public life."
As a program and a movement, political Catholicism was started by Prussian Catholics in the second half of the 19th century, as a response to secular social concepts. The main reason were the measures by Chancellor Otto von Bismarck to limit the influence of Catholic Church, first in Prussia, and then in united Germany. That struggle is known in history as the Kulturkampf.
From Germany, political Catholic social movements spread in Austria-Hungary, especially in today's Austria, Ukraine, Slovenia and Croatia. Catholic Action was the name of many groups of lay Catholics who were attempting to encourage a Catholic influence on political society.
After the 1891 encyclical Rerum novarum ("Of new things") by Pope Leo XIII, political Catholic movements got a new impulse for development, and they spread the area of their involvement. With this encyclical, the Catholic Church expanded its interest in social, economical, political and cultural issues, and it called for a drastic conversion of Western society in the 19th century in the face of capitalist influences. Following the release of the document, the labour movement which had previously floundered began to flourish in Europe and later in North America. Catholic believers, both lay and clergy alike, had a desire for active social and political engagement in order to deal with acute social problems according to Catholic Christian principles, as opposed to a purely secular approach. For example, Mary Harris Jones, better known as "Mother Jones", and the National Catholic Welfare Council were central in the campaign to end child labour in the United States during the early 20th century.