Bangkok is the capital and most populous city of the Kingdom of Thailand. It is known in Thai as Krung Thep Maha Nakhon (กรุงเทพมหานคร) or simply Krung Thep. The city occupies 1,568.7 square kilometers (605.7 square miles) in the Chao Phraya River delta in Central Thailand, and has a population of over 8 million, or 12.6 percent of the country's population. Over 14 million people (22.2 percent) live within the surrounding Bangkok Metropolitan Region, making Bangkok an extreme primate city, significantly dwarfing Thailand's other urban centers in terms of importance.
Bangkok traces its roots to a small trading post during the Ayutthaya Kingdom in the 15th century, which eventually grew and became the site of two capital cities: Thonburi in 1768 and Rattanakosin in 1782. Bangkok was at the heart of the modernization of Siam, later renamed Thailand, during the late 19th century, as the country faced pressures from the West. The city was at the center of Thailand's political struggles throughout the 20th century, as the country abolished absolute monarchy, adopted constitutional rule and underwent numerous coups and several uprisings. The city grew rapidly during the 1960s through the 1980s and now exerts a significant impact on Thailand's politics, economy, education, media and modern society.
Information from:
en.wikipedia.org/wiki/Bangkok 