Rattanakosin Period(1782-Present)
After Taksin's death, Chakri became the first king of the Chakri dynasty, Rama I. His first action was to transfer the royal capital across the river from Thonburi to Bangkok and build the Grand Palace.
King Rama III reopened relations with western nations and developed trade with China. King Rama IV, he made many social and economic reforms during his reign.
King Rama V abolished slavery and improving the public welfare and administrative system. Thailand changed from an absolute monarchy to a constitutional monarchy during Rama VI. King Ananda Mahidol . The country's name was changed from Siam to Thailand with the advent of democratic government in 1939.