Qing received tribute from Korea annually, from Ryûkyû once every two years, from Siam every three years, Annam every four years, and from Laos and Burma once in a decade. Though all of these tributary relationships had ''de facto'' ended by the mid-to-late 19th century, an 1899 document still lists all of those polities as tributaries.<ref>Schottenhammer. p31.</ref> | Qing received tribute from Korea annually, from Ryûkyû once every two years, from Siam every three years, Annam every four years, and from Laos and Burma once in a decade. Though all of these tributary relationships had ''de facto'' ended by the mid-to-late 19th century, an 1899 document still lists all of those polities as tributaries.<ref>Schottenhammer. p31.</ref> |