• Tucson
  • Taicang City

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.

Taicang City, a county-level city hosted by Suzhou City in Jiangsu Province, is located in the southeast of Jiangsu Province, on the south bank of the Yangtze River Estuary. It is bordered by the Yangtze River to the east, across the river from Chongming District, Baoshan District and Jiading District of Shanghai to the south, Kunshan City to the west and Changshu City to the north. The total area of the city is 823 square kilometers, the water area of the Yangtze River is 143.97 square kilometers, and the land area is 665.96 square kilometers. It has jurisdiction over 1 street, 6 towns and Taicang Port Economic Development Zone. Taicang culture belongs to Wu Yue culture, Taicang people belong to Jiangsu and Zhejiang people, and use Wu language. Taicang, as the nearest city to Shanghai, has formed the "co-city effect" of geographical proximity, popularity, economic integration and language and culture in Shanghai for a long time. Taicang is close to Shanghai and becomes the "back garden" of Shanghai. Taicang belongs to the subtropical monsoon area with four distinct seasons.
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