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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.

Luzhou, a prefecture-level city in Sichuan Province, is known as Jiang Yang in ancient times, also known as Wine City and Jiangcheng. Luzhou is a regional central city in the combination of Sichuan, Yunnan, Guizhou and Chongqing, an important trade and logistics center in the Chengdu-Chongqing economic circle, and an important port city in the upper reaches of the Yangtze River. at the same time, it is also the third batch of national new-type urbanization comprehensive pilot areas and cross-border e-commerce comprehensive pilot areas. World-class liquor industry base, national important food industry base with famous and high-quality liquor as the main body, circular chemical base, clean energy production base, national high-performance hydraulic parts high-tech industrialization base, one of the nine national construction machinery production bases. It belongs to the subtropical humid climate zone, and the three-dimensional climate in the southern mountain area is obvious. Luzhou is a famous national historical and cultural city with more than two thousand years of history and culture. Jiang Yang was established in the Western Han Dynasty and Luzhou was established in the same year of Emperor Liang Wudi. Own Luzhou
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