Credits at the end tell us that Mongkut and his son, educated by Anna, led their country into the twentieth century, established democracy (up to a point), and so on. No mention is made of Bangkok's role as a world center of sex tourism, which also of course carries on traditions established by the great king.
"It's one of the most awful and awesome panoramas of human suffering ever imagined in a work of fiction. But the audacity of the wholesale suffering that L&J imagine is dwarfed by the greater audacity of their wholly disregarding the very scenario they have presented. The authors and their protagonists seem wholly unperturbed by all of this death and destruction, save in how it presents a logistical inconvenience and cramps the travel plans of our heroes."