• Tucson
  • KaiJiang country

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.

Kaijiang County, which belongs to Dazhou City, Sichuan Province, is located in eastern Sichuan, at the southern foot of Dabashan Mountain, Kaizhou District and Wanzhou District of Chongqing in the east, Liangping District in Chongqing in the south, Dachuan District in Sichuan in the west and Xuanhan in Sichuan in the north, with a total area of 1032.55 square kilometers. Kaijiang County, formerly known as Xinning County, has a history of more than 1450 years since the second year of the abolition of the Western Wei Emperor in the Southern and Northern dynasties (553). It has been named since August of 1914. There are intangible cultural heritages such as stubborn sticks, Gui Yangko, stonework, dragon dance, color pavilions, stilts and other intangible cultural heritages, as well as cultural relics and monuments such as Echeng Shanfan stele, gem old county dam, Shuangniushan, Rende Bridge and Baoquan Pagoda, which are famous cultural counties in Bashu. Gantang Hu Festival Xiaofang, Ren Shi Tao Pai Fang is the national key cultural relics, Gantang Huolong Lantern Festival has become the folk culture brand of Sichuan and Chongqing. Kaijiang is a revolution.
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