Area 51 is the common name of a highly classified United States Air Force (USAF) facility located within the Nevada Test and Training Range. A remote detachment administered by Edwards Air Force Base, the facility is officially called Homey Airport (XTA/KXTA) or Groom Lake. Details of the facility's operations are not made public, but the USAF says that it is an open training range, and it is commonly thought to support the development and testing of experimental aircraft and weapons systems. The USAF acquired the site in 1955, primarily for flight testing the Lockheed U-2 aircraft.
California is a state in the Western United States. It is bordered by Nevada to the east, Arizona to the southeast, the Pacific Ocean to the west, Oregon to the north, and the Mexican state of Baja California to the south. With over 39.5 million residents across a total area of approximately 163,696 square miles (423,970 km2), it is the most populous and the third-largest U.S. state by area. It is also the most populated subnational entity in North America and the 34th most populous in the world. The Greater Los Angeles area and the San Francisco Bay Area are the nation's second and fifth most populous urban regions respectively, with the former having more than 18.7 million residents and the latter having over 9.6 million. Sacramento is the state's capital, while Los Angeles is the most populous city in the state and the second most populous city in the country. Los Angeles County is the country's most populous, while San Bernardino County is the largest county by area in the country. San Francisco, which is both a city and county, is the second most densely populated major city in the country and the fifth most densely populated county in the country, behind four of New York City's five boroughs.
Houston is the most populous city in the U.S. state of Texas, fourth-most populous city in the United States, most populous city in the Southern United States, as well as the sixth-most populous in North America, with an estimated population of 2,320,268 in 2019. Located in Southeast Texas near Galveston Bay and the Gulf of Mexico, it is the seat of Harris County and the principal city of the Greater Houston metropolitan area, which is the fifth-most populous metropolitan statistical area in the United States. Houston is the southeast anchor of the greater megaregion known as the Texas Triangle.
Los Angeles, officially the City of Los Angeles and often abbreviated as L.A., is the largest city in California. It has an estimated population of nearly 4 million, and is the second-largest city in the United States, after New York City, and the third-largest city in North America, after Mexico City and New York City. Los Angeles is known for its Mediterranean climate, ethnic and cultural diversity, Hollywood entertainment industry, and its sprawling metropolitan area.
North America is a continent entirely within the Northern Hemisphere and almost all within the Western Hemisphere. It can also be described as the northern subcontinent of the Americas. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Caribbean Sea, and to the west and south by the Pacific Ocean. Because it is on the North American Tectonic Plate, Greenland is included as part of North America geographically.
Tokyo, officially the Tokyo Metropolis, is the de facto capital and most populous prefecture of Japan. Located at the head of Tokyo Bay, the prefecture forms part of the Kantō region on the central Pacific coast of Japan's main island of Honshu. Tokyo is the political and economic center of the country, as well as the seat of the Emperor of Japan and the national government. As of 2021, the prefecture has an estimated population of 13,960,236. The Greater Tokyo Area is the most populous metropolitan area in the world, with more than 37.393 million residents as of 2020.
Miami, officially the City of Miami, is a coastal metropolis located in Miami-Dade County in southeastern Florida, United States. It is the third most populous metropolis on the East coast of the United States, and it is the seventh largest in the country. The city has the third largest skyline in the U.S. with over 300 high-rises, 55 of which exceed 491 ft (150 m).
A metropolitan area or metro is a region consisting of a densely populated urban core and its less-populated surrounding territories under the same administrative jurisdiction, sharing industries, commercial areas, transport network, infrastructures and housing. A metro area usually comprises multiple jurisdictions and municipalities: neighborhoods, townships, boroughs, cities, towns, exurbs, suburbs, counties, districts, and even states and nations like the eurodistricts. As social, economic and political institutions have changed, metropolitan areas have become key economic and political regions.
Postal codes used in the United Kingdom, British Overseas Territories and Crown dependencies are known as postcodes. They are alphanumeric and were adopted nationally between 11 October 1959 and 1974, having been devised by the General Post Office. A full postcode is known as a "postcode unit" and designates an area with several addresses or a single major delivery point.
Population density is a measurement of population per unit area, or exceptionally unit volume; it is a quantity of type number density. It is frequently applied to living organisms, most of the time to humans. It is a key geographical term. In simple terms, population density refers to the number of people living in an area per square kilometre.
An unincorporated area is a region not governed by a local municipal corporation. Similarly, an unincorporated community is a settlement not governed by its own local municipal corporation, but is administered as part of larger administrative divisions, such as a township, parish, borough, county, city, canton, state, province, or country. Occasionally, municipalities dissolve or disincorporate, which may happen if they become fiscally insolvent, and services become the responsibility of a higher administration. Widespread unincorporated communities and areas are a distinguishing feature of the United States and Canada. Most other countries of the world have either no unincorporated areas at all, or these are very rare; typically remote, outlying, sparsely populated, or uninhabited areas.
An urban area, or built-up area, is a human settlement with a high population density and infrastructure of built environment. Urban areas are created through urbanization and are categorized by urban morphology as cities, towns, conurbations or suburbs. In urbanism, the term contrasts to rural areas such as villages and hamlets; in urban sociology or urban anthropology it contrasts with natural environment. The creation of early predecessors of urban areas during the urban revolution led to the creation of human civilization with modern urban planning, which along with other human activities such as exploitation of natural resources led to a human impact on the environment. "Agglomeration effects" are in the list of the main consequences of increased rates of firm creation since. This is due to conditions created by a greater level of industrial activity in a given region. However, a favorable environment for human capital development would also be generated simultaneously.
India 