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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.

Xiuwu County is located in the northwest of Henan Province and belongs to Jiaozuo City. It is connected with Huixian County and Huojia County in the east, Boai County and Jiaozuo City in the west, and Wuyi County in the south. The Dongda River on the northern boundary is bordered by Liushukou Town, Zezhou County, Jincheng, and Zhenghuo Township, Lingchuan County, Jincheng, respectively. It is one of the sources of the Haihe River Basin. Xiuwu County has a total area of 632.9 square kilometers and has jurisdiction over 5 towns, 3 townships, 1 industrial and trade zone and 1 office, 187 villages and 282000 people, with an area of 320000 mu of cultivated land. Xiuwu County has a long history and is an ancient county in China. Before the Zhou Dynasty, this place was called "Ningyi". At the end of the Shang Dynasty (1046 BC), King Wu of Zhou set up troops to cut down the army. When the army passed through Ningyi in case of heavy rain for three days, it could not be done, so it was stationed on the spot to practice martial arts, so it was changed to "martial arts". Since then, it has been more than 3000 years. A.D.
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