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Washington, D.C., formally the District of Columbia, also known as Washington or D.C. or locally simply as the District, is the capital city and federal district of the United States. It is located on the east bank of the Potomac River, which forms its southwestern and southern border with the U.S. state of Virginia, and it shares a land border with the U.S. state of Maryland on its other sides. The city was named for George Washington, a Founding Father and the first president of the United States, and the federal district is named after Columbia, the female personification of the nation. As the seat of the U.S. federal government and several international organizations, the city is an important world political capital. It is one of the most visited cities in the U.S., with over 20 million annual visitors as of 2016.

The U.S. Constitution provides for a federal district under the exclusive jurisdiction of Congress; the district is not a part of any U.S. state (nor is it one itself). The signing of the Residence Act on July 16, 1790, approved the creation of the capital district located along the Potomac River near the country's East Coast. The City of Washington was founded in 1791, and Congress held its first session there in 1800. In 1801, the territory, formerly part of Maryland and Virginia (including the settlements of Georgetown and Alexandria), officially became recognized as the federal district. In 1846, Congress returned the land originally ceded by Virginia, including the city of Alexandria; in 1871, it created a single municipal government for the remaining portion of the district. There have been efforts to make the city into a state since the 1880s, a movement that has gained momentum in recent years, and a statehood bill passed the House of Representatives in 2021.

Ningqiang County is located in the southwest of Shaanxi Province, with Qinling Mountains in the north and Pillow Mountain in the south. The county has jurisdiction over 16 towns, 2 subdistrict offices and 200 administrative villages with a total population of 340000. Ningqiang is located in the confluence of the Qinling Mountains and the Bashan mountain system, with high in the southeast, low in the northwest and Wuding Mountain uplift in the middle. Ningqiang has abundant rainfall and humid air, and most areas have a warm temperate mountain humid monsoon climate with strong precipitation, with an annual precipitation of up to 1812.2 mm. Ningqiang County is a mountainous county with the confluence of the north and the south and the belt of Shu. It is the main gateway and golden passage from the northwest to the southwest. Baocheng, Yang'an Railway across the county, 108 National Highway, Western Han Expressway passing through; is the birthplace of the Han River, known as "the first city of the Han River" reputation, in November 2015 Ningqiang County was China
Travel Notes In Ningqiang County