what is the capital vietnam, Which city is the capital of Vietnam?

Vietnam's Capital: What Is It?

Hanoi is an ancient city with a thousand-year history[4]. People began to live in Hanoi around 3000 BC. Its prototype of urbanization, "Guo Luo City", was built in 200 BC. Hanoi was an ancient Chinese territory. In 111 BC, Emperor Wu of the Han Dynasty established Jiaozhi Prefecture, and Hanoi was within its scope. During the Southern Song Dynasty, Songping Prefecture was established in Hanoi, with its seat in Changguo County. During the Sui Dynasty, it was renamed Songping County, which was the seat of Jiaozhi Prefecture. In 621 AD, the Tang Dynasty moved the seat of Jiaozhou to Songping County (now Hanoi) and built a city. Later, it became the Annan Protectorate, which governed the area. In the late Tang Dynasty, it became the residence of the Jinghai Army Jiedushi. In 2007, the ruins of the Tang Dynasty Annan Protectorate were unearthed in Hanoi. At the end of the 9th century, Nanzhao occupied Jiaozhou for a time. Gao Pian, a Tang Dynasty minister who served as the Protector General of Annan and the Jiedushi of Jinghai, built Luocheng to resist the invasion of Nanzhao. Jiaozhou (Hanoi) was then called "Da Luo". After Vietnam broke away from China and became independent in 939, the present-day Hanoi area was once the capital of the Vietnamese feudal dynasties of Ly, Tran and Hou Le, and was known as the "land of thousand-year-old cultural relics".