New Mexico is a state in the Southwestern region of the United States. It is one of the Mountain States of the southern Rocky Mountains, sharing the Four Corners region with Utah, Colorado, and Arizona. It also borders the state of Texas to the east and southeast, Oklahoma to the northeast, and shares an international border with the Mexican states of Chihuahua and Sonora to the south. New Mexico’s largest city is Albuquerque, and its state capital is Santa Fe, the oldest state capital in the U.S., founded in 1610 as the government seat of Nuevo México in New Spain, as well as the highest at 6,998 feet (2,133 m).

New Mexico is the fifth-largest of the fifty states by area, but with just over 2.1 million residents, ranks 36th in population and 45th in population density. Its climate and geography are highly varied, ranging from forested mountains to sparse deserts; the northern and eastern regions exhibit a colder alpine climate, while the west and south are warmer and more arid. The Rio Grande and its fertile valley runs from north-to-south, creating a riparian biome through the center of the state that supports a bosque habitat and distinct Albuquerque Basin climate. One-third of New Mexico’s land is federally owned, and the state hosts many protected wilderness areas and 15 national parks and monuments, including three UNESCO World Heritage Sites, the most of any U.S. state.

New Mexico’s economy is highly diversified, including cattle ranching, agriculture, lumber, scientific and technological research, tourism, and the arts; major sectors include mining, oil and gas, aerospace, media, and film.Its total real gross domestic product (GDP) in 2023 was over $105 billion, with a GDP per capita of $49,879. State tax policy is characterized by low to moderate taxation of resident personal income by national standards, with tax credits, exemptions, and special considerations for military personnel and favorable industries. New Mexico has a significant U.S. military presence, including White Sands Missile Range, KUMMSC, and strategically valuable federal research centers, such as the Sandia and Los Alamos National Laboratories. The state hosted several key facilities of the Manhattan Project, which developed the world’s first atomic bomb, and was the site of the first nuclear test, Trinity.