geog 9.3
Overview of Mexico's Regional Division
Mexico is broadly subdivided into four distinct main regions, each with unique characteristics:
Central Mexico (the core region): This area is characterized by high plateaus and valleys, temperate climates, and is the historical and political heartland of the country, containing the majority of the population.
Northern Mexico (borderlands): Stretching along the U.S. border, this region is predominantly arid or semi-arid, known for its extensive deserts, ranches, and significant industrial development tied to cross-border trade.
Gulf Tropics: Located along the Gulf of Mexico, this region features hot, humid tropical lowlands, abundant rainfall, and significant oil and agricultural production.
Pacific Tropics: Running down Mexico's Pacific coast, this region also generally experiences tropical climates, known for its tourism, agriculture, and fishing industries.
Mexico City
Description: Mexico City is centrally located within Central Mexico in the Valley of Mexico. It ranks as the second-largest metropolitan area in Latin America, following São Paulo, Brazil, and boasts a sprawling population of approximately 22 million people within its greater metropolitan area.
Claims:
It holds the distinction of being the world's largest Spanish-speaking city by population.
Mexico as a country is considered the most urbanized nation in Latin America, with a significant portion of its population residing in major urban centers.
Demographics:
The overwhelming majority of the population adheres to the Roman Catholic faith, reflecting the strong Spanish colonial influence.
The ethnic composition is primarily mestizo, meaning individuals of mixed Native American and European (predominantly Spanish) descent, a result of centuries of cultural and genetic blending since the colonial period.
Sinking of Mexico City
Issue: Mexico City has been experiencing severe and persistent subsidence (sinking) for over a century, primarily as a direct consequence of extensive groundwater extraction from the underlying aquifer.
Rate: The current rate of sinking has reached critical and alarming levels, with the city subsiding by approximately 20 inches () per year. This rapid subsidence causes significant damage to infrastructure, including buildings, roads, and utilities.
Evidence of Sinking:
Numerous historic and modern buildings throughout the city exhibit visible signs of subsidence, such as leaning, cracking, and uneven foundations.
A prominent example is the Angel of Independence statue, a national monument. Originally constructed at ground level, it has required the addition of 8 steps in the past, and then another 14 steps, totaling 22 steps, to compensate for the ground level sinking around its base, starkly illustrating the extent of subsidence.
Historical Background:
The city's foundation lies over the ancient Aztec capital of Tenochtitlan, which was ingeniously built on an island in Lake Texcoco, part of a complex system of interconnected lakes.
Upon their arrival in the 1500s, Spanish colonizers progressively drained most of Lake Texcoco to prevent flooding and allow for urban expansion. This decision had dire long-term environmental consequences, severely depleting the critical water table beneath the city.
By the early 1900s, the sinking rate was recorded at 3.5 inches () per year, which significantly escalated to 11.5 inches () per year by the 1950s.
Initial Government Response (1950s):
In an attempt to mitigate the accelerating sinking, the government implemented policies to cap large-scale groundwater extraction by drilling new wells outside the city basin and limiting pumping within it.
Recent Findings:
Recent comprehensive studies indicate that the capping of water extraction is no longer sufficient or effective in halting the process, and subsidence is projected to continue indefinitely unless groundwater levels are fully restored.
Experts now believe that recovering the significant lost elevation and the aquifer's original storage capacity is an irreversible and impossible task due to the permanent compaction of clay layers.
Water Supply:
Over 70% of Mexico City's drinking water continues to be sourced directly from groundwater extraction within the highly stressed basin, making the city's water supply deeply vulnerable to ongoing subsidence and replenishment challenges.
Environmental Challenges
Pollution in Mexico City
Geography:
Mexico City's unique topography, nestled within a valley surrounded by high mountains (such as the Sierra Nevada range), makes it highly susceptible to thermal inversions. These inversions trap cold, dense air—along with accumulated air pollution—close to the ground, preventing its dispersal.
Source of Pollution:
Pollution primarily stems from dense human activities within the metropolitan area:
Extensive burning of fossil fuels from industries, residential heating, and power generation.
Emissions from numerous power plants located in and around the valley.
Vast vehicle emissions from millions of cars, trucks, and buses.
Statistics on Population Growth and Air Pollution:
The city experienced explosive population growth, rocketing from just over 3 million residents in the 1950s to approximately 14 million by the 1980s, and currently standing at about 22 million in the metropolitan area.
This growth led to record-breaking pollution levels throughout the 1980s and 1990s, with alarmingly high concentrations of ground-level ozone, carbon monoxide, sulfur dioxide, nitrogen dioxide, and particulate matter ().
In the 1980s, there were roughly 124 cars per 1,000 residents; many were older models with inefficient engines and ran on leaded gasoline, a highly toxic fuel.
Unregulated and heavily polluting factories and power plants were widespread, contributing significantly to the severe air quality issues.
In 1992, the United Nations officially named Mexico City the world's most polluted city.
Air quality was frequently described as severe, with anecdotal reports of birds visibly falling from the sky due to respiratory distress from toxicity.
Improvement Initiatives
Current Status:
Thanks to concerted efforts, Mexico City's pollution levels have dramatically decreased. It has moved from being the world's most polluted city to approximately the 917th position globally, demonstrating significant progress in urban environmental management.
Government Policies:
The ProAir program, launched in 1995, represented a comprehensive, multi-faceted strategy to combat air pollution, focusing on:
Reducing overall energy consumption through efficiency measures and public awareness campaigns.
Promoting the adoption of cleaner and more efficient energy sources, including natural gas and renewables.
Enhancing and expanding public transportation networks, such as the Metrobus system and cable car lines, to reduce private vehicle reliance.
Regulating fuel quality and consumption, including the phasing out of leaded gasoline and promoting low-sulfur fuels.
Implementing technology shifts in industry and vehicle manufacturing, coupled with stringent emission controls and catalytic converters.
Fostering environmental education and promoting sustainability practices among residents.
Encouraging cultural participation in green initiatives and expanding urban green areas.
Intensive reforestation efforts within and surrounding the urbanized areas.
Building institutional capacity within environmental agencies and supporting scientific research into air quality and pollution control.
Strengthening health protections for vulnerable populations impacted by air quality.
Historical Context
Mexican Revolution
Timeline: The Mexican Revolution was a decade-long conflict from 1910 to 1920. It is crucial not to confuse it with earlier, distinct conflicts such as the War of Independence (1810-1821), which freed Mexico from Spanish rule, and the War of Reform (1850s), a civil war between liberals and conservatives.
Background:
Although Mexico achieved independence from Spain in 1821, the subsequent decades were marked by profound political instability, frequent coups, and foreign interventions.
The War of Reform (1858-1860) was a brutal civil war that ultimately ended in victory for the liberal government. This led to the implementation of the Laws of La Reforma, which aimed to modernize the country by disestablishing military and ecclesiastical privileges and confiscating vast amounts of church property. However, this policy inadvertently contributed to increased land ownership inequality, as confiscated lands often ended up in the hands of wealthy elites rather than being distributed to the poor, exacerbating rural discontent.
Key Figures:
Pancho Villa (José Doroteo Arango Arámbula) and Emiliano Zapata Salazar were iconic revolutionary leaders. Villa primarily operated in Northern Mexico, commanding a formidable cavalry division, while Zapata led the agrarian movement in the south, championing demands for land reform and indigenous rights under the slogan "Land and Liberty."
Their separate but allied forces played a pivotal role in overthrowing the long-standing dictatorship of President Porfirio Diaz.
Outcome:
Despite the revolution's aims, much of the land intended for redistribution to the poor farmers and indigenous communities frequently went to powerful absentee landlords, foreign investors, or state control, perpetuating agrarian injustice.
Villa's public image was profoundly influenced and often romanticized by Hollywood films and American journalists, which helped shape international perception of the revolution but also sometimes distorted his true motives and actions.
Villa was tragically assassinated in 1923, three years after the official conclusion of the revolution, in a highly contested ambush.
Zapatista Army of National Liberation (EZLN)
Date: On January 1, 1994, coinciding with the implementation of the North American Free Trade Agreement (NAFTA), the Zapatista Army of National Liberation (EZLN) launched an armed uprising against the Mexican state from Chiapas, a southern state. This rebellion brought international attention to long-standing issues of indigenous rights, economic marginalization, and resistance to globalization.
Unpreparedness of Government: The Mexican government was completely caught off guard by the organized and highly visible rebellion, which quickly seized several towns in Chiapas.
Motivations:
Strong opposition to proposed increased tourism development plans in indigenous regions, fearing cultural erosion and displacement.
A direct and vocal response to the signing and implementation of NAFTA, which the EZLN argued would further impoverish indigenous farmers by exposing them to competition from subsidized agricultural imports from the U.S. and Canada, without providing adequate support or protection.
A profound desire for local autonomy and control over their ancestral land, natural resources, and cultural practices, advocating for self-determination for indigenous communities.
Conflict Outcome:
The initial clashes between the EZLN and the Mexican military led to significant casualties and a subsequent refugee crisis as thousands fled the conflict zones.
Following a brief but intense conflict and intense national and international pressure, the military largely withdrew from EZLN-held areas. However, this withdrawal did not resolve the underlying socio-economic issues, leading to continued poverty and lack of formal services in these self-governing Zapatista enclaves. Importantly, these communities often principledly refused government aid, seeking to maintain their autonomy and reject state dependency.
Geographic and Environmental Aspects
Climate Overview:
Approximately half of Mexico lies north of the Tropic of Cancer, meaning it falls within the temperate zone, characterized predominantly by desert and semi-arid conditions, particularly in the vast northern states. This region experiences significant temperature variations and sparse rainfall.
The majority of Mexico, situated south of the Tropic of Cancer, falls within the tropical zone. This area generally benefits from more favorable climates, including tropical wet and dry seasons, higher rainfall, and warmer temperatures, supporting more diverse agriculture and ecosystems.
Natural Disaster Risks: Mexico is strategically located within the geologically active Ring of Fire, a major area in the basin of the Pacific Ocean where a large number of earthquakes and volcanic eruptions occur. This tectonic setting results in the presence of numerous active and dormant volcanoes across the country, as well as a high risk of seismic activity.
Case Study: Paricutin Volcano:
Located in the state of Michoacán, the Paricutin Volcano famously erupted on February 20, 1943. What makes this event unique is that it was one of the few volcanoes whose entire life cycle—from its initial emergence as a fissure in a cornfield—was observed and documented by scientists and local residents from the very beginning.
The eruption resulted in slow-moving lava flows that gradually covered and destroyed nearby villages, most notably Paricutin and San Juan Parangaricutiro, leaving only the church steeple of San Juan standing half-buried and visible as a landmark.
The volcano demonstrated rapid growth and explosive eruption processes during its early stages. Over a nine-year eruption period, it progressively built up its cone, reaching a final height of 1,391 feet () above the cornfield ground (or 9,210 feet () above sea level) before becoming an extinct volcano in 1952.
Today, Paricutin holds significant historical and educational value as a natural wonder and a tourist site, with the ghostly half-buried church of San Juan serving as a poignant and iconic landmark, attracting visitors who trek to witness geological history.
Conclusion
Reflection: The comprehensive history of Mexico and its diverse regional divisions intertwines deeply with a complex interplay of environmental factors, profound social dynamics, and turbulent political developments, vividly demonstrating the nuanced and often challenging relationship between natural forces and human influences on society and culture.