The history of Thailan begins with the migration of the Thais from their ancestral home in southern China into mainland southeast Asia around the 10th century AD. Prior to this Mon, Khmer and Malay kingdoms ruled the region. The Thais established their own states starting with Sukhothai and then Ayutthaya kingdom. These states fought each other and were under constant threat from the Khmers, Burma and Vietnam. Much later, the European colonial powers threatened in the 19th and early 20th centuries, but Thailand survived as the only Southeast Asian state to avoid colonial rule. After the end of the absolute monarchy in 1932, Thailand endured sixty years of almost permanent military rule before the establishment of a democratic system.