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Baltimore (/ˈbɔːltɪmɔːr/ BAWL-tim-or, locally: /bɔːldəˈmɔːr/ bawl-da-MOR or /ˈbɔːlmər/ BAWL-mər) is the most populous city in the U.S. state of Maryland, fourth most populous city in the Mid-Atlantic, and the 30th most populous city in the United States with a population of 585,708 in 2020. Baltimore was designated an independent city by the Constitution of Maryland[a] in 1851, and today is the most populous independent city in the United States. As of 2021, the population of the Baltimore metropolitan area was estimated to be 2,838,327, making it the 20th largest metropolitan area in the country. Baltimore is located about 40 miles (64 km) north northeast of Washington, D.C., making it a principal city in the Washington–Baltimore combined statistical area (CSA), the third-largest CSA in the nation, with a 2021 estimated population of 9,946,526.

Prior to European colonization, the Baltimore region was used as hunting grounds by the Susquehannock Native Americans, who were primarily settled further northwest than where the city was later built. Colonists from the Province of Maryland established the Port of Baltimore in 1706 to support the tobacco trade with Europe, and established the Town of Baltimore in 1729. The first printing press and newspapers were introduced to Baltimore by Nicholas Hasselbach and William Goddard respectively, in the mid-18th century.

The Battle of Baltimore was a pivotal engagement during the War of 1812, culminating in the failed British bombardment of Fort McHenry, during which Francis Scott Key wrote a poem that would become "The Star-Spangled Banner", which was eventually designated as the American national anthem in 1931. During the Pratt Street Riot of 1861, the city was the site of some of the earliest violence associated with the American Civil War.

Erqi District is the central city of Zhengzhou, the capital of Henan Province, named for commemorating the general strike of the Beijing-Han Railway on February 7, 1923. It is located in the southwest of the center of Zhengzhou, bordered by Guancheng District in the east, adjacent to Zhongyuan District and Xingyang City in the west, Xinmi City and Xinzheng City in the south, and Jinshui District in the north. As of 2017, Erqi District covers a total area of 159square kilometers, has 17 streets, has a resident population of 801500, and the urbanization rate is 90.39%. Erqi District has a long history and heavy culture. There are Han Dynasty dwellings Denggongzhai, Ming Dynasty Zhou mourning Wang Mausoleum and many other historical sites. The site of Lao Nu Temple in Zhengzhou pushed forward the origin of Chinese civilization for 30-50 000 years; the blue-glazed porcelain of the Shang Dynasty advanced the firing history of Chinese porcelain by more than 1000 years; Yan ceramics, Zheng Shang porcelain and other porcelain have gone abroad and entered the world. One hundred years
Airport In Erqi District - Zhengzhou Xinzheng International Airport
Zhengzhou Xinzheng International Airport (Zhengzhou Xinzheng International Airport, IATA: CGO, ICAO: ZHCC), referred to as "Xinzheng Airport", is located at the junction of Xinzheng City and Zhongmu County, Zhengzhou City, Henan Province, China. It is a 4F international civil airport and the first in China The core component of Zhengzhou Airport Economic Comprehensive Experimental Zone, a national airport   , an international air cargo hub airport, one of the eight major regional hub airports in China   , "7×24 hours" "full time" customs clearance international airports, large domestic aviation hub airports   , international scheduled flight airports, and national first-class air ports open to the outside world.     
On August 28, 1997, Zhengzhou Xinzheng International Airport was completed and opened to traffic. In May 2013, the relocation of the second phase of the project began. In January 2014, the second phase of the reconstruction and expansion project started construction. On December 22, 2015, the second phase expansion project of Zhengzhou Xinzheng International Airport was officially put into operation. On January 7, 2016, the second runway of Zhengzhou Xinzheng International Airport was opened. On March 30, 2016, the T1 terminal was closed for renovation, and all flights were moved to the T2 terminal.
As of December 2015, Zhengzhou Xinzheng International Airport has two terminals (T1 terminal is out of service), with a total area of ​​620,000 square meters; T1 and T2 terminals have 158 parking bays, including 149 passenger aircraft parking bays ; It has two runways, 3400 meters and 3600 meters respectively.   As of December 2018, Zhengzhou Xinzheng International Airport has 55 passenger airlines, 208 passenger routes, and 116 passenger cities; 21 cargo airlines, 34 cargo routes, and 40 cargo cities.   
In 2020, the passenger throughput of Zhengzhou Xinzheng International Airport was 21.4067 million passengers, a year-on-year decrease of 26.5%, ranking 11th in the country; the cargo and mail throughput was 639,400 tons, a year-on-year increase of 22.5%, ranking 6th in the country, with 178,600 transport movements , a year-on-year decrease of 17.4%.  
On August 16, 2022, the North Cargo Area of ​​Zhengzhou Xinzheng International Airport will start trial operation.  
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