immigration law for children and grandchildren of American missionaries born abroad

American evangelical missionaries for decades have left their country to work in other countries and besides the religious work levrama to the four corners of the world to American culture. Today filihos and grandchildren of this missionary wish to live in the United States, land of their ancestors , but they can not . Are people who love America and its culture and are unable to live in the country of their ancestors for not being part of immigration policy programs that most often allow people who do not know and do not accept the culture and style American life live within its borders as American descendants do not have the right to live in the land of their parents and grandparents