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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.

Tongxu, known as Xianping in ancient times, has a long history and culture, and now belongs to Kaifeng, the ancient capital of the seven dynasties. Tongxu County is located in the middle and east of Henan Province, the middle and lower reaches of the Yellow River, belonging to the eastern plain of Henan Province. The topography is high in the west and low in the east, high in the north and low in the south, tilting from northwest to southeast. It faces the Yellow River to the north, Songshan Shaolin to the west, Shangqiu, the important town in the east of Henan Province to the east, Zhoukou, a famous historical city to the south, 80 kilometers to the northwest from the provincial capital Zhengzhou, and 40 kilometers to the north to Kaifeng, the ancient capital. Located in the core area of the construction of the national strategic Central Plains Economic Zone, it is the route of Hengxiang railway in the planning. Tongxu County has jurisdiction over six towns and six townships, with a width of 30.5km from east to west and 34.8km from north to south, with a total area of 766.22 square kilometers. It is a part of the Huang-Huai Plain formed by the impact to the south of the Yellow River. The soil area of the county is 963742 mu.
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