Since the late 1800s and, especially since the US signed the NAFTA and GATT, whose purpose is to reduce trade tariffs and therefore simplify the trade between U.S. and other countries, the contracted migration from Mexico to the US increased and converted slowly into undocumented migration born from necessity. Concluding, the topic of undocumented migration to the US splits the opinions and concerns large numbers of authors. Reyna Grande and Luis Alberto Urrea, both authors with a migrant background, discuss the subject of unauthorized immigration in their works. Grande 's Across a Hundred Mountains tells the stories of Juana Garcia, a twelve-year-old girl, who is searching for her father and Adelina Vasquez, a young prostitute, who returns to her family after running away with a man. Juana and her family lose her younger sister and daughter due to a terrible accident, therefore Juana 's father Miguel finds himself forced to borrow money from the richest man in the village. In order to repay his dept, Juana 's father has no different choice other than to cross the US-Mexico illegally and earn money abroad. Grande 's book describes Juana 's and her mother 's struggles to survive without their father/husband, whereby Lupe suffers a mental breakdown and gets arrested for killing of the creditor. Juana decides to find her later dead father ends in hers and Adelina 's acquaintance. At the end of the story, Adelina finds death at hand of her abusive boyfriend and Juana takes