Bernt Oftestad 
The Catholic Church and Liberal Democracy [PDF ebook] 

The Roman Catholic Church”s critical stance towards liberalism and democracy following the French Revolution and through the 19th century was often entrenched, but the Second Vatican Council of the 1960s saw a shift in the Church”s attitude towards democracy. In recent years, a conflict has emerged between Church doctrine and modern liberalism under Popes John Paul II and Benedict XVI.
This book is a comprehensive overview of the Catholic Church”s relationship to modern liberal democracy, from the end of the 18th century until today. It is a connection that is situated within the context of the history of ideas itself.