• Tucson
  • Sichuan

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.

Sichuan, referred to as Sichuan or Shu, is one of the 23 provinces in China, the capital of Chengdu. It is located in the inland of southwest China, bounded by 26 °03 north latitude 34 °19 miles north latitude and 97 °21 miles east longitude 108 °12 'east longitude, connecting Chongqing to the east, Yunnan and Guizhou to the south, Tibet to the west, Shaanxi, Gansu and Qinghai to the north. The geomorphology of Sichuan Province varies greatly from east to west, and the topography is complex and diverse. it is located in the transitional zone between the first Qinghai-Tibet Plateau and the second plain of the middle and lower reaches of the Yangtze River, which is located in the Chinese mainland topography. The topography is high in the west and low in the east. It is composed of mountains, hills, plain basins and plateaus. Sichuan Province has three major climates, namely, the humid climate in the middle subtropics of Sichuan Basin, the subtropical semi-humid climate in the mountains of southwest Sichuan, the alpine plateau climate in northwest Sichuan, and the overall pleasant climate.
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