Answer:
because it comes from an actual immigrant whose experience agrees with Freedman's statement that one out of every five immigrants was detained.
Explanation:
According to Edward Corsi's quotation from the book "Immigrant Kids", Angelo Pellegrini recounts his experience of his family being detained at Ellis Island as his sister who was ill was rejected and his mother was told that she can't be allowed to go in.
This quotation adds credibility to the text because it comes from an immigrant whose experience agrees with Freedman's statement that one out of five immigrants was detained.
