Thailand's history of leadership changes make it an anocratic state. Thailand has been in a constant state of political upheaval since 1993. Coups d'état and widespread political corruption are the main causes of political instability. Thailand experienced a period of political liberalization under General Prem Tinsulanonda, an unelected prime minister from 1980 to 1988. A series of coups ensued soon afterward. General Suchinda Kraprayoon led a coup against Prime Minister Chatichai Choonhavan on February 23, 1991. After the Black May incident, Suchinda was forced to resign, and Anand Panyarachun was assigned the position of temporary prime minister. Thaksin Shinawatra won the 2001 elections and became prime minister; he won again in 2005 but was deposed in the 2006 Thai coup d'état. After a new constitution was adopted, Samak Sundaravej and his People's Power Party (Thailand) won the 2007 election, and Sundaravej became prime minister. However, a conflict of interest caused Sundaravej to be ousted, and Somchai Wongsawat was elected as the new prime minister. Shortly after his election, Prime Minister Wongsawat and the PPP was found guilty of electoral fraud, and Wongsawat lost his position. Abhisit Vejjajiva's election as the next prime minister was met with opposition by "Red Shirts." On July 3, 2011, Yingluck Shinawatra, belonging to the Pheu Thai Party, was elected as prime minister. After mass protests in 2013, Shinawatra was deposed by a military coup led by General Prayut Chan-o-cha, who is the current prime minister.