Previously when commemorating the 170th anniversary of the signing of the Treaty of Guadalupe Hidalgo we journeyed to the far western corner of the new border that the peace agreement between the U.S. and Mexico created. Surrounded by hills and beach-going crowds on the Mexican side, Boundary Monument 258 marks the U.S.-Mexico border between the corners of Tijuana and San Diego. At 258, it is the highest numbered boundary marker along the land portion of the U.S.-Mexico border which begins with Boundary Monument 1, located 700 miles to the east just outside of Ciudad Juárez-El Paso. Unlike the busy, tightly-controlled scene at Playas de Tijuana/Friendship Park, Boundary Monument 1 is in a hidden canyon along the Rio Grande and without major fence barriers. If, as some border artists have asserted, boundaries are scars on the Earth , this is where the wound across the desert begins.
At the close of the 2010s, Univision KMEX Channel 34 and Telemundo KVEA Channel 52 regularly compete for the highest ratings among all television viewers in Los Angeles according to the Nielsen ratings service. KMEX and KVEA’s high ratings – beating the long-established big three English-language networks – speaks to the demographic growth and vitality of the Spanish-speaking Latino American communities of the greater L.A. region. The ratings bonanza currently enjoyed by the local Univision and Telemundo stations is a dramatic counterpoint to the relatively humble, but significant technical origins of Spanish-language television in the U.S. and in Southern California more than half-a-century ago.
An official advertisement placed by KMEX Channel 34 in a September 1962 issue of La Opinión. Variations of this advertisement were placed in billboards around Los Angeles that fall.
A rare photograph from 1848 depicts the Basilica of Our Lady of Guadalupe and its surrounding environment in the town of Guadalupe Hidalgo as it appeared when the famous treaty between Mexico and U.S. was signed here on February 2, 1848. According to historian Richard Griswold del Castillo, the treaty was most likely signed in one of the (since demolished) buildings to the left of Mexico's most sacred Catholic shrine, the site of the appearance of the Virgen of Guadalupe to St. Juan Diego Cuauhtlatoatzin. After the treaty was signed, the U.S. and Mexican representatives held a mass at the historic Basilica. 
An aerial shot of the Basilica de Nuestra Señora de Guadalupe and its environs as it appears today. The original historic church [center] was opened in 1709 on the site of two older churches that occupied the sacred space after the 1531 apparitions of Our Lady of Guadalupe to St. Juan Diego. The green-roofed, circular modern Basilica was built between 1974-1976 by architect Pedro Ramírez Vázquez. To the right of the old basilica is the Capuchin Nun's Church and the Capilla del Cerro. IMAGE SOURCE: https://www.sophiatours.com.sv/uploads/image/A_Basilica.jpg
While the world has changed much in the 170 years since U.S. negotiator Nicholas Trist and Mexican representatives Luis G. Cuevas, Bernardo Couto and Miguel Atristain signed the treaty – and indeed the town of Guadalupe Hidalgo now another neighborhood of Mexico City known simply as the Villa de Guadalupe – the consequences of the treaty between the two countries remain with us amid debates over Mexican/Latin American immigration and border security enforcement.
In this short photo essay, we will briefly explore the far western terminus of the U.S.-Mexican border at the “division line between Upper and Lower California" at the Pacific Ocean” - known as the "Initial Point of Boundary" between Mexico and the U.S. - to consider a small piece of the modern impact of the boundaries created by the Treaty of Guadalupe Hidalgo, signed on February 2, 1848.
Our tour of the Altar Valley picks up at the U.S.-Mexico border crossing at Sásabe, Sonora and Sasabe, Arizona. As already mentioned, in the 2000s and early 2010s the Altar Valley corridor was the principal entry way for undocumented immigrants headed into the United States. The Altar Valley is named after the town and river of the same name in Sonora. On the northern side of the international boundary the Altar Valley – which runs from the border to the extreme western suburbs of Tucson – has few population centers. In Arizona, the Altar Valley is primarily oriented north-to-south and surrounded by the Baboquivari Mountains to the west and the Sierrita, Cerro Colorado, Las Guijas and San Luis Mountains to the east. The smuggling of people and contraband in this narrow valley greatly concerns many local and national U.S. residents.
Comment area for "The August 27, 1918 Battle of Ambos Nogales and the First U.S.-Mexican Border Fences" Online Exhibit
Nestled in the heart of the Sonoran Desert, the Altar Valley Corridor spans the Mexican-U.S. border in two distinct portions in northwestern Sonora and southwestern Arizona. Despite its aridity, the Altar Valley Corridor hosts a variety of plant and animal life adapted to the desert’s summer heat and winter chills. It is here at the Tohono O’odham people (historically called “Papagos” by Spaniards and Mexicans) have their most sacred mountain – the bell-shaped Baboquivari Peak. Separated from the desert cities of Hermosillo, Caborca, Tucson, Phoenix, and their busy highways, the Altar Valley is still an important (and irregular) corridor for the movement of people and contraband between the two neighboring countries. It is in the remote Altar Valley Corridor that most of the land crossings into the U.S. by undocumented immigrants (as well as a significant amount of narcotics smuggling) took place in the first decades of the 21st Century. In this photo essay, we will take a tour of this corridor, from the town of Altar in Sonora to the forgotten bordertowns at Sásabe and the northern edge of the Altar Valley in Arizona as a way of understanding one of the most important settings in conversations about the U.S.-Mexican border.
U.S.-Mexican, Latino, and Border Historian