She has described seeing the U.S. Border Patrol track and monitor Latinos in her community and noticed it as "being hauntingly similar to what many of what us African American kids and teens were experiencing in terms of the rise of the war on drugs at the same time." She experienced her own "share of locker sweeps at school and was registered as a 'gang member' by the local police." She even watched as a friend was accused of dealing drugs and shot four times by the police. In the neighborhoods where she lived, armed border officers targeted Mexicans"snatched them off buses, chased them across highways, and took my friend's uncle in the middle of the night." Observing these parallels between the war on drugs and the war on immigrants, she felt compelled "to go on and study these systems."
Migra! A History of the U.S. Border Patrol Her first book,
Migra! A History of the U.S. Border Patrol, was about Mexican immigration to the United States. The
MacArthur Foundation has called it "the first significant academic history" of the
Border Patrol. When asked why she wrote the book, Hernández referred back to her formative experiences in San Diego and said: "I just had this passion in my belly that was driving me to want to write this history of the border patrol.... I really wanted to understand why this was happening." She tells the story from the "discordant beginnings" of the organization in 1924 as an "inauspicious" outfit to its emergence as a large professional police force. According to the
New York Journal of Books, she "chronicles a disturbing tale of the violent origins of the U.S. Border Patrol". Reviewers have called it "impressive and painstakingly researched", a "rich and detailed analysis", "well written and highly insightful," and praised its used of previously "untapped source materials". For this book, Hernández was awarded the Clements Prize from the William P. Clements Center for Southwest Studies in 2010, Honorable Mention for the John Hope Franklin Prize by the American Studies Association, and Honorable Mention for the Lora Romero First Book Publication Prize also from the American Studies Association.
City of Inmates: Conquest, Rebellion, and the Rise of Human Caging in Los Angeles Her second book,
City of Inmates: Conquest, Rebellion, and the Rise of Human Caging in Los Angeles is about the rise of mass incarceration in Los Angeles, which currently maintains the nation’s largest jail system and includes "federal and state prisons, local jails, immigrant detention centers, and youth 'camps'". The book's central argument is that "mass incarceration is mass elimination", which Hernández develops by examining the historical growth of the Los Angeles region from the first native people through the "
Watts Rebellion" in 1965. She documents how "settlers persistently deployed incarceration as a means of purging, removing, caging, containing, erasing, disappearing, and otherwise eliminating indigenous communities and racially targeted populations". She traces how white settlers waged a war of elimination on indigenous people, and attempted to keep African Americans, Chinese and Mexican people from settling. While writing the book she had to overcome the fact that police and other public officials had destroyed the overwhelming majority of the historical records. To overcome this problem she had to rely on what she calls the "rebel archive", the records of the resistance and rebellion of those "who fought the rise of jails and prisons and detentions centers." Reviewers have called the book "extraordinarybracing, brave, and profoundly important"; "superb"; an "incisive and meticulously researched study of the transformation of Los Angeles from a small group of Native American communities in the 18th century into an 'Aryan city of the sun' in the 20th"; "phenomenal...path-breaking" and "insightful". Others have noted the book's "radically new perspective" and praised the fact that it "demonstrates incontrovertibly that the systems of immigrant exclusion and mass incarceration emerged together and fed each other." In 2018 it won the
American Book Award from the
Before Columbus Foundation, the John Hope Franklin Publication Prize from the
American Studies Association, the
James A. Rawley Prize from the
Organization of American Historians, and the Robert G. Athearn Award from the
Western History Association. This revolution is often viewed from its impact on Mexico and Central America, but "the author argues convincingly that it 'also remade the United States.'" She describes an American government just as hostile to the revolutionaries as was the Mexican government. U.S. companies and wealthy Americans had extensive financial interests and land ownership in Mexico — land that Hernández describes as stolen from poor "miners, farmworkers and cotton pickers." U.S. agents and police provided extensive help to the Mexican government by spying on, harassing and jailing the revolutionaries and their supporters. The book has been described by reviewers as a "beautifully crafted, impressively inclusive history of the Mexican Revolution", "an incredible new book", and "history at its most elucidating". The
Houston Press humorously captured their take by titling their review "'Bad Mexicans' with Good Intentions." A reviewer from the
Los Angeles Times observes that the book's "central premise" is "the idea that Mexican and U.S. histories aren’t isolated from each other but are so intertwined that you can’t separate them." Hernández agreed, saying she was "taking everything and pivoting and positioning it within the context of U.S. history." In an interview with
Publishers Weekly she spoke to her motivation, "it was when Donald Trump used the phrase 'bad hombres,' that I knew that this story needed to be told". She continued, "Imperialists and white supremacists have used this kind of language to stir up anti-Mexican, anti-Latino, and anti-immigrant sentiment.... when you start to hear that racist rhetoric, dig a little deeper to ask what's it all about?" ==Million Dollar Hoods==