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Tucson (/ˈtuːsɒn, tuːˈsɒn/; Spanish: Tucson, O'odham: Cuk-Ṣon) is a city in and the county seat of Pima County, Arizona, United States, and is home to the University of Arizona. It is the second largest city in Arizona behind Phoenix, with a population of 542,629 in the 2020 United States census, while the population of the entire Tucson metropolitan statistical area (MSA) is 1,043,433. The Tucson MSA forms part of the larger Tucson-Nogales combined statistical area (CSA). Both Tucson and Phoenix anchor the Arizona Sun Corridor. The city is 108 miles (174 km) southeast of Phoenix and 60 mi (97 km) north of the U.S.–Mexico border. Tucson is the 34th largest city and the 53rd largest metropolitan area in the United States (2014).

Major incorporated suburbs of Tucson include Oro Valley and Marana northwest of the city, Sahuarita south of the city, and South Tucson in an enclave south of downtown. Communities in the vicinity of Tucson (some within or overlapping the city limits) include Casas Adobes, Catalina Foothills, Flowing Wells, Midvale Park, Tanque Verde, Tortolita, and Vail. Towns outside the Tucson metro area include Benson to the southeast, Catalina and Oracle to the north, and Green Valley to the south.

Tucson was founded as a military fort by the Spanish when Hugo O'Conor authorized the construction of Presidio San Agustín del Tucsón in 1775. It was included in the state of Sonora after Mexico gained independence from the Spanish Empire in 1821. In 1853, the United States acquired a 29,670 square miles (76,840 km2) region of present-day southern Arizona and southwestern New Mexico from Mexico under the Gadsden Purchase. Tucson served as the capital of the Arizona Territory from 1867 to 1877. Tucson was Arizona's largest city by population during the territorial period and early statehood, until it was surpassed by Phoenix by 1920. Nevertheless, population growth remained strong during the late 20th century. In 2017, Tucson was the first American city to be designated a "City of Gastronomy" by UNESCO.

Suzhou, referred to as "Su" in ancient times, is an important part of the prefecture-level cities under the jurisdiction of Jiangsu Province and the Yangtze River urban agglomeration. Approved by the State Council, it is one of the national historical and cultural cities and scenic tourism cities, the national high-tech industrial base and one of the important central cities in the Yangtze River Delta. By 2018, the city had jurisdiction over five districts and four county-level cities in escrow, with a total area of 8488.42 square kilometers, a built-up area of 461.65 square kilometers, a resident population of 10.7217 million, and an urban population of 8.1539 million, with a urbanization rate of 76.05%. Suzhou is located in the southeast of Jiangsu Province and the middle of the Yangtze River Delta, facing Shanghai to the east, Jiaxing to the south, Taihu Lake to the west and the Yangtze River to the north, longitude 119 °55 to the east, 121 °20 to the north, latitude 3.
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