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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.

Haizhou District, which belongs to Lianyungang City, Jiangsu Province, is located in the north of the Yangtze River Delta and northeast of Jiangsu Province; it is located on the shore of the Yellow Sea, where the Silk Road Economic Belt meets the 21st Century Maritime Silk Road, the Yangtze River Delta Economic Circle and the Shandong Peninsula urban agglomeration. It is the political, economic and cultural center of Lianyungang City. At the same time, it is also the root of Lianyungang city and the source of culture. It is known as "the famous county of the East China Sea" and "the first city from the east of Huaihai". Haizhou District has a long history, which has been established for more than 2000 years since the pre-Qin period. The Journey to the West and Mirror Huayuan were born here. Jinping Phosphate Mine, one of the four major phosphate mines in China, is located in China. The county was founded in 212 BC and the state was established 1500 years ago. It has the rock paintings of Jiangjun Cliff, the cliff statues of Kongwang Mountain, the round stone statues of the Han Dynasty, and the "five Palace tunes".
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