• Tucson
  • Lingbao City

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.

Lingbao City is located in the western part of Henan Province at the junction of Henan, Qin and Jin provinces, with Qinling Mountains in the south and the Yellow River in the north. It has jurisdiction over 10 towns, 5 townships and 440 administrative villages, with a total area of 3011 square kilometers and a resident population of 735100 (2017), including 847000 mu of arable land and 110000 non-agricultural population. It is known as "the city of gold", "the hometown of apples", "the source of Taoism" and "tourist attractions". Lingbao City, located in the middle reaches of the Yellow River, is one of the earliest activities and birthplaces of human beings. And located in the ancient Chang'an, Luoyang between the two ancient capitals, ancient tombs, ancient sites are rich. After liberation, more than 20,000 precious cultural relics have been unearthed one after another, and nearly 100 of them are rare in the country. In December 2017, he was selected as one of China's top 100 industrial counties (cities). October 2018, selected 2
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