• Tucson
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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.

Huaiji County, which belongs to Zhaoqing City, Guangdong Province, is located in the northwest of Guangdong Province, the north of Zhaoqing City and the upper reaches of Suijiang River, a tributary of Beijiang River. It is located in the uplift belt of western Guangdong, with basin areas in the west, low hills and high hills in the middle and south, with a subtropical climate, long summer and short winter, abundant rainfall, and an annual average temperature of 21.1℃. With a total area of 3554.07 square kilometers, it is the largest county in Zhaoqing County. As of 2017, Huaiji County has jurisdiction over 18 towns and one nationality township, with a registered population of 1.1 million and a resident population of 848400. Huaiji County was established in Yintun Township, Sihui County, Nanhai County in the 13th year of Song Yuanjia of the Southern Dynasty (436 years). The Song Dynasty formed the basic realm of today's Huaiji County. The Yuan Dynasty was transferred to Hezhou, Huguangzhong Book Co., Ltd. The Ming Dynasty was transferred to Wuzhou Prefecture in Guangxi. It was assigned to Guangdong Province in March 1952 and Zhao in 1988.
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