Chicago is the largest city in the U.S. state of Illinois and the Midwestern United States, as well as the third-most populous city in the United States with more than 2.8 million residents. Adjacent to Lake Michigan, the Chicago metropolitan area (commonly referred to as Chicagoland) has a population of more than 9.5 million people in three U.S. states, Illinois, Wisconsin and Indiana, and was the third largest U.S. metropolitan area in 2000. One of the largest cities in North America, Chicago is among the world's twenty-five largest urban areas by population, and rated an alpha world city by the World Cities Study Group at Loughborough University.

Chicago incorporated as a city in 1837 after being founded in 1833 near a portage between the Great Lakes and the Mississippi River watershed. The city soon became a major transportation hub in North America and the transportation, financial and industrial center of the Midwest. Today the city's attractions bring 44.2 million visitors annually. O'Hare International is the second busiest airport in the world. The city has a notable and famous political culture, is a stronghold of the Democratic Party, and has been home to numerous influential politicians, including the first African-American President of the United States, Barack Obama. Chicago has also been chosen as one of the final 4 candidates to host the 2016 Summer Olympics, and the only American city still in the running.

Chicago is often called the "Windy City", "Chi-Town", "Second City," and the "City of Big Shoulders".

First settlers

During the mid-18th century the area was inhabited by a native American tribe known as the Potawatomis, who had taken the place of the Miami and Sauk and Fox peoples. The first permanent settler in Chicago, Haitian Jean Baptiste Pointe du Sable, arrived in the 1770s, married a Potawatomi woman, and founded the area’s first trading post. In 1803 the United States Army built Fort Dearborn, which was destroyed in the 1812 Fort Dearborn massacre. The Ottawa, Ojibwa, and Potawatomi later ceded the land to the United States in the 1816 Treaty of St. Louis. On August 12, 1833, the Town of Chicago was organized with a population of 350. Within seven years it grew to a population of over 4,000. The City of Chicago was incorporated on March 4, 1837. The name "Chicago" is the French rendering of the Miami-Illinois name shikaakwa, meaning “wild leek.” The sound shikaakwa in Miami-Illinois literally means 'striped skunk', and was a reference to wild leek, or the smell of onions. The name initially applied to the river, but later came to denote the site of the city.

Railway link

The city began its step toward regional primacy as an important transportation hub between the eastern and western United States. Chicago’s first railway, Galena and Chicago Union Railroad, opened in 1838, which also marked the opening of the Illinois and Michigan Canal. The canal allowed steamboats and sailing ships on the Great Lakes to connect to the Mississippi River. A flourishing economy brought residents from rural communities and immigrants abroad. Manufacturing and retail sectors became dominant among Midwestern cities, influencing the American economy, particularly in meatpacking, with the advent of the refrigerated rail car and the regional centrality of the city's Union Stock Yards.

In February 1856, the Chesbrough plan for the building of Chicago's and the United States' first comprehensive sewerage system was approved by the Common Council. The project raised much of central Chicago to a new grade. Untreated sewage and industrial waste now flowed into the Chicago River, thence into Lake Michigan, polluting the primary source of fresh water for the city. The city responded by tunneling two miles (3 km) out into Lake Michigan to newly built water cribs. In 1900, the problem of sewage was largely resolved when Chicago reversed the flow of the river, a process that began with the construction and improvement of the Illinois and Michigan Canal and completed with the Chicago Sanitary and Ship Canal leading to the Illinois River which joins the Mississippi River.

Chicago Fire

After the Great Chicago Fire of 1871 destroyed a third of the city, including the entire central business district, Chicago experienced rapid rebuilding and growth. During its rebuilding period, Chicago constructed the world's first skyscraper in 1885, using steel-skeleton construction. Labor conflicts and unrest followed, including the Haymarket affair on May 4, 1886. Concern for social problems among Chicago’s lower classes led Jane Addams to be a co-founder of Hull House in 1889. Programs developed there became a model for the new field of social work. The city also invested in many large, well-landscaped municipal parks, which also included public sanitation facilities.

World's Fair

In 1893, Chicago hosted the World's Columbian Exposition on former marshland at the present location of Jackson Park. The Exposition drew 27.5 million visitors, and is considered among the most influential world's fairs in history. The University of Chicago was founded in 1892 on the same South Side location. The term "midway" for a fair or carnival referred originally to the Midway Plaisance, a strip of park land that still runs through the University of Chicago campus and connects Washington and Jackson Parks.

20th century

The 1920s brought notoriety to Chicago as gangsters, including the notorious Al Capone, battled each other and law enforcement on the city streets during the Prohibition era. The 1920s also saw a major expansion in industry. The availability of jobs attracted African Americans from the South. Arriving in the tens of thousands during the Great Migration, the newcomers had an immense cultural impact. It was during this wave that Chicago became a center for jazz, with King Oliver leading the way. In 1933, Mayor Anton Cermak was assassinated while in Miami with President Franklin D. Roosevelt.

In the late summer of 1942, during World War II, Chicago held a practice black-out. According to one witness, "the sirens sounded, the lights went out while airplanes flew overhead to spot violators". After about 30 minutes the beacon on top of the Palmolive Building came back on and the lights were quickly restored.

On December 2, 1942, physicist Enrico Fermi conducted the world’s first controlled nuclear reaction at the University of Chicago as part of the top-secret Manhattan Project.

Mayor Richard J. Daley was elected in 1955, in the era of machine politics. Starting in the 1960s, many residents left the city for the suburbs, taking out the heart of many neighborhoods, leaving impoverished and disadvantaged citizens behind. Structural changes in industry caused heavy losses of jobs for lower skilled workers. In 1966 James Bevel, Martin Luther King Jr., and Al Raby led the Chicago Open Housing Movement, which culminated in agreements between Mayor Richard J. Daley and the movement leaders. Two years later, the city hosted the tumultuous 1968 Democratic National Convention, which featured physical confrontations both inside and outside the convention hall, including full-scale riots, or in some cases police riots, in city streets. Major construction projects, including the Sears Tower (which in 1974 became the world’s tallest building), McCormick Place, and O'Hare Airport, were undertaken during Richard J. Daley's tenure. When he died, Michael Anthony Bilandic was mayor for three years. His loss in a primary election has been attributed to the city’s inability to properly plow city streets during a heavy snowstorm. In 1979, Jane Byrne, the city’s first female mayor, was elected. She popularized the city as a movie location and tourist destination.

In 1983 Harold Washington became the first African American to be elected to the office of mayor, in one of the closest mayoral elections in Chicago. After Washington won the Democratic primary, racial motivations caused a few Democratic alderman and ward committeemen to back the Republican candidate Bernard Epton, who ran on the slogan Before it’s too late, a thinly veiled appeal to fear. Washington’s term in office saw new attention given to poor and minority neighborhoods. His administration reduced the longtime dominance of city contracts and employment by ethnic whites. Washington died in office of a heart attack in 1987, shortly after being elected to a second term. Current mayor Richard M. Daley, son of the late Richard J. Daley, was elected in 1989. He has led many progressive changes to the city, including improving parks; creating incentives for sustainable development, including green roofs; and major new developments. Since the 1990s, the city has undergone a revitalization in which some lower class neighborhoods have been transformed as new middle class residents have settled in the city. In 2008, the city earned the title of "City of the Year" from GQ for contributions in architecture and literature, a renaissance in the world of politics and downtown's starring role in the Batman movie The Dark Knight

Chicago attracted a combined 44.2 million people in 2006 from around the nation and abroad. Upscale shopping along the Magnificent Mile, thousands of restaurants, as well as Chicago's eminent architecture, continue to draw tourists. The city is the United States' third-largest convention destination. Most conventions are held at McCormick Place, just south of Soldier Field. The historic Chicago Cultural Center (1897), originally serving as the Chicago Public Library, now houses the city's Visitor Information Center, galleries, and exhibit halls. The ceiling of Preston Bradley Hall includes a 38-foot (11 m) Tiffany glass dome. Millennium Park, initially slated to be unveiled at the turn of the 21st century, and delayed for several years, sits on a deck built over a portion of the former Illinois Central rail yard. The park includes the reflective Cloud Gate sculpture (known locally as "The Bean"). A Millennium Park restaurant outdoor transforms into an ice rink in the winter. Two tall glass sculptures make up the Crown Fountain. The fountain's two towers display visual effects from LED images of Chicagoans' faces, with water spouting from their lips. Frank Gehry's detailed stainless steel band shell Pritzker Pavilion, hosts the classical Grant Park Music Festival concert series. Behind the pavilion's stage is the Harris Theater for Music and Dance, an indoor venue for mid-sized performing arts companies, including Chicago Opera Theater and Music of the Baroque.

In 1998, the city officially opened the Museum Campus, a 10-acre (4-ha) lakefront park surrounding three of the city's main museums: the Adler Planetarium, the Field Museum of Natural History, and the Shedd Aquarium. The Museum Campus joins the southern section of Grant Park which includes the renowned Art Institute of Chicago. Buckingham Fountain anchors the downtown park along the lakefront. The Oriental Institute, part of the University of Chicago, has an extensive collection of ancient Egyptian and Near Eastern archaeological artifacts. Other museums and galleries in Chicago are the Chicago History Museum, DuSable Museum of African-American History, Museum of Contemporary Art, the Peggy Notebaert Nature Museum, the Polish Museum of America, Museum of Broadcast Communications and the Museum of Science and Industry.

Parks

When Chicago incorporated in 1837, it chose the motto "Urbs in Horto", a Latin phrase which translates into English as "City in a Garden". Today the Chicago Park District consists of 552 parks with over 7,300 acres (30 km²) of municipal parkland as well as 33 sand beaches along Lake Michigan, nine museums, two world-class conservatories, 16 historic lagoons and 10 bird and wildlife gardens. Lincoln Park, the largest of these parks, has over 20 million visitors each year, making it second only to Central Park in New York City. Nine lakefront harbors located within a number of parks along the lakefront render the Chicago Park District the nation's largest municipal harbor system. In addition to ongoing beautification and renewal projects for existing parks, a number of new parks have been added in recent years such as Ping Tom Memorial Park, DuSable Park and most notably Millennium Park. The wealth of greenspace afforded by Chicago's parks is further augmented by the Cook County Forest Preserves, a network of open spaces containing forest, prairie, wetland, streams, and lakes that are set aside as natural areas which lie along the city's periphery, home to both the Chicago Botanic Garden and Brookfield Zoo.