Autonomous City of Buenos Aires vs Changchun City

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Buenos Aires ( or ; Spanish pronunciation: [ˈbwenos ˈajɾes]), officially Autonomous City of Buenos Aires, is the capital and largest city of Argentina. The city is located on the western shore of the estuary of the Río de la Plata, on the South American continent's southeastern coast. "Buenos Aires" can be translated as "fair winds" or "good airs", but the former was the meaning intended by the founders in the 16th century, by the use of the original name "Real de Nuestra Señora Santa María del Buen Ayre", named after the Madonna of Bonaria in Sardinia. The Greater Buenos Aires conurbation, which also includes several Buenos Aires Province districts, constitutes the fifth-most populous metropolitan area in the Americas, with a population of around 15.6 million.The city of Buenos Aires is neither part of Buenos Aires Province nor the Province's capital; rather, it is an autonomous district. In 1880, after decades of political infighting, Buenos Aires was federalized and removed from Buenos Aires Province. The city limits were enlarged to include the towns of Belgrano and Flores; both are now neighborhoods of the city. The 1994 constitutional amendment granted the city autonomy, hence its formal name of Autonomous City of Buenos Aires (Ciudad Autónoma de Buenos Aires; "CABA").

Its citizens first elected a chief of government (i.e. mayor) in 1996; previously, the mayor was directly appointed by the President of the Republic. Buenos Aires' quality of life was ranked 91st in the world in 2018, being one of the best in Latin America. In 2012, it was the most visited city in South America, and the second-most visited city of Latin America (behind Mexico City).It is known for its preserved eclectic European architecture and rich cultural life. Buenos Aires held the 1st Pan American Games in 1951 and was the site of two venues in the 1978 FIFA World Cup. Most recently, Buenos Aires hosted the 2018 Summer Youth Olympics and the 2018 G20 summit.Buenos Aires is a multicultural city that is home to multiple ethnic and religious groups. Several languages are spoken in the city in addition to Spanish, contributing to its culture as well as to the dialect spoken in the city and in some other parts of the country. This is because since the 19th century, the city, and the country in general, has been a major recipient of millions of immigrants from all over the world, making it a melting pot where several ethnic groups live together. Thus, Buenos Aires is considered one of the most diverse cities of the Americas.

Source: Wikipedia

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Changchun (Chinese: 长春) is the capital and largest city of Jilin Province, People's Republic of China. Lying in the center of the Songliao Plain, Changchun is administered as a sub-provincial city, comprising 7 districts, 1 county and 2 county-level cities. According to the 2010 census of China, Changchun had a total population of 7,674,439 under its jurisdiction. The city's metro area, comprising 5 districts and 4 development areas, had a population of 3,815,270 in 2010, as the Shuangyang and Jiutai districts are not urbanized yet. It is one of the biggest cities in Northeast China, along with Shenyang, Dalian and Harbin. The name of the city means "long spring" in Chinese. Between 1932 and 1945, Changchun was renamed Hsinking (Chinese: 新京; pinyin: Xīnjīng; lit.: 'new capital') by the Japanese as it became the capital of the Japanese puppet state of Manchukuo, occupying modern Northeast China. After the foundation of the People's Republic of China in 1949, Changchun was established as the provincial capital of Jilin in 1954.

Known locally as China's "City of Automobiles", Changchun is an important industrial base with a particular focus on the automotive sector. Because of its key role in the domestic automobile industry, Changchun was sometimes referred to as the "Detroit of China." Apart from this industrial aspect, Changchun is also one of four "National Garden Cities" awarded by the Ministry of Construction of P.R. China in 2001 due to its high urban greening rate.Changchun is also one of the top 40 cities in the world by scientific research as tracked by the Nature Index according to the Nature Index 2020 Science Cities. The city is home to several major universities, notably Jilin University and Northeast Normal University, members of China's prestigious universities in the Project 211.

Source: Wikipedia