**Historical Development**:
– First human groups arrived in Santiago around the 10th millennium BC.
– Permanent settlers formed agricultural communities by 800 AD.
– Pedro de Valdivia founded Santiago in 1541.
– Santiago was destroyed in 1541 by indigenous attacks.
– Santiago became the economic center of Chile by 1895.
– Santiago’s population was 507,296 in 1920, a 52.5% increase from 1907.
– Santiago’s population grew from 952,075 in 1940 to 1,907,378 in 1960.
– The Intercommunal Plan of Santiago proposed a population limit of 3,260,000 residents.
– Santiago Metro opened in 1975.
– Two perpendicular lines were established by 1978.
– Torre Entel was built in 1975.
– Santiago Metro became the most populous municipality in 1992.
– An earthquake in 1985 caused damage.
**Urban Expansion**:
– Urban areas expanded from 6,500 hectares in 1930 to 38,296 hectares in 1980.
– Urban area expanded to 62,000 hectares in 1979.
– Santiago reached 40,619 hectares by the early 1990s.
– La Florida experienced urban sprawl.
– Population growth was seen in Las Condes and Maipú.
– New communes were established in 1981 and 1991.
**City Infrastructure**:
– Santiagos cityscape features 19th-century neoclassical architecture.
– Several stand-alone hills define the cityscape.
– The Mapocho River flows through the city.
– The Andes Mountains are visible from most parts of Santiago.
– Providencia Avenue is a commercial hub.
– Barrio Alto attracted high-rise buildings.
– Sanhattan emerged as a business center.
– Air pollution was addressed with legislative measures.
– The Metro system expanded with new lines.
**Modern Developments**:
– Gran Torre Costanera is the tallest building in South America.
– The Civic District was revitalized in the 21st century.
– Titanium La Portada and Gran Torre Santiago skyscrapers were opened.
– There was a debate on mandatory earthquake standards in 2010.
– Socioeconomic inequality and geosocial fragmentation are issues.
**Geography**:
– Santiago Basin is surrounded by mountains.
– The elevation varies from 400m to over 700m.
– Santiago is flanked by the Andes and Coastal Range.
– The Mapocho River flows through the city.
– Urban growth is expanding east up the Andean slopes.
