This February 2003, pastoral letter signed by Mexican and American bishops in the Catholic Church forms a foundation for the church’s strong support of immigration reform that gives undocumented immigrants legal protections. The letter addresses the broad social issues of all Hispanic immigration.
Selected numbered paragraphs:
102. We recognize the phenomenon of migration as an authentic sign of the times. We see it in both our countries through the suffering of those who have been forced to become migrants for many reasons. To such a sign we must respond in common and creative ways so that we may strengthen the faith, hope, and charity of migrants and all the People of God. Such a sign is a call to transform national and international social, economic, and political structures so that they may provide the conditions required for the development for all, without exclusion and discrimination against any person in any circumstance.
103. In effect, the Church is increasingly called to be “sign and instrument both of a very closely knit union with God and of the unity of the whole human race” (Lumen Gentium, no. 1). The Catholic bishops of the United States and Mexico, in communion with the Holy Father in his 1995 World Migration Day message, affirm that
In the Church no one is a stranger, and the Church is not foreign to anyone, anywhere. As a sacrament of unity and thus a sign and a binding force for the whole human race, the Church is the place where illegal immigrants are also recognized and accepted as brothers and sisters. It is the task of the various Dioceses actively to ensure that these people, who are obliged to live outside the safety net of civil society, may find a sense of brotherhood in the Christian community. Solidarity means taking responsibility for those in trouble.
The Church must, therefore, welcome all persons regardless of race, culture, language, and nation with joy, charity, and hope. It must do so with special care for those who find themselves–regardless of motive–in situations of poverty, marginalization, and exclusion.

104. We ask our presidents to continue negotiations on migration issues to achieve a system of migration between the two countries that is more generous, just, and humane. We call for legislatures of our two countries to effect a conscientious revision of the immigration laws and to establish a binational system that accepts migration flows, guaranteeing the dignity and human rights of the migrant. We ask public officials who are in charge of formulating, implementing, and executing immigration laws to reexamine national and local policies toward the migrant and to use their leadership positions to erase misconceptions about migration. We ask adjudicators who process immigrants’ legal claims to create a welcoming atmosphere that does not threaten their confidence or security. We encourage the media to support and promote a genuine attitude of welcoming toward migrants and immigrants.
105. We, the Catholic bishops of the United States and Mexico, pledge ourselves to defend the migrant. We also pledge to support the creation of the necessary conditions so that all may enjoy the fruit of their work and life in their homeland, if they so wish.
106. We stand in solidarity with you, our migrant brothers and sisters, and we will continue to advocate on your behalf for just and fair migration policies. We commit ourselves to animate communities of Christ’s disciples on both sides of the border to accompany you on your journey so that yours will truly be a journey of hope, not of despair, and so that, at the point of arrival, you will experience that you are strangers no longer and instead members of God’s household. We pray that, wherever you go, you will always be conscious of your dignity as human beings and of your call to bring the Good News of Jesus Christ, who came that we “might have life and have it more abundantly” (Jn 10:10). We invite you who are forced to emigrate to maintain contact with your homes and, especially, to maintain fidelity to your families so that you treasure your cultural values and the gift of faith and so that you bring these treasures to whatever place you go.