Catechism of the Catholic Church §1927 — excerpt
It is the role of the state to defend and promote the common good of civil society. the common good of the whole human family calls for an organization of society on the international level.
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.