According to the Compendium of the Social Doctrine of the Church, the Catholic Church teaches that forced migration is the product of inequality between nations. In essence, individuals migrate in order to create better lives for their families. Therefore, as a church, we should protect the dignity of migrants and prevent situations that lead to their abuse.
For more information about this teaching, review sections 297 and 298 of the Compendium of the Social Doctrine of the Church which address the subject of immigration: