Here are a few works that Catholics should read in regards to their faith and citizenship:
Living the Gospel of Life- http://www.usccb.org/prolife/gospel.shtml
This is a pastoral statement of U.S. Catholic bishops.
Evangelium Vitae- http://www.vatican.va/edocs/ENG0141/_INDEX.HTM
This is a one of the best of Pope John Paul II’s encyclicals.
Render Unto Caesar- http://astore.amazon.com/joerrosr07-20/detail/0385522282
This is the latest book by a great archbishop! Archbishop Chaput applies the teachings of the Church over the last 2,000 years into how Catholics are called to be active and good U.S. Citizens; yet we are not to leave our faith at church or at home, but that it is who we are always and everywhere.