The following are quotes from the Catechism of the Catholic Church on the topics of migration and immigration.
¶1911: Internal quote is from Gaudium et Spes: “The unity of the human family, embracing people who enjoy equal natural dignity, implies a universal common good. This good calls for an organization of the community of nations able to provide ‘for men’s different needs, both in the fields of social life—such as food supplies, health, education, labor and also in certain special circumstances which can crop up here and there, e.g., the need to promote the general improvement of developing countries, or to alleviate the distressing conditions in which refugees dispersed throughout the world find themselves, or also to assist migrants and their families. to alleviate the distressing conditions in which refugees dispersed throughout the world find themselves, or also to assist migrants and their families.’”
¶2211: “The political community has a duty to honor the family, to assist it, and to ensure especially… the right to private property, to free enterprise, to obtain work and housing, and the right to emigrate.”
¶2241: “The more prosperous nations are obliged, to the extend they are able, to welcome the foreigner in search of the security and means of livelihood which he cannot find in his country of origin. Public authorities should see to it that the natural right is respected that places a guest under the protection of those who receive him.”
¶2433: “Access to employment and to professions must be hope to all without unjust discrimination; men and women, healthy and disabled, natives and immigrants. For its part society should, according to circumstances, help citizens find work and employment.”
For more, see http://ccc.usccb.org/flipbooks/catechism/index.html