A zamanin mulkin Rama na biyu, masarautar ta ga an farfado da al'adu bayan dimbin yake-yake da suka addabi mulkin magabacinsa;musamman a fagen fasaha da adabi.Mawakan da Rama II ya yi aiki sun haɗa da Sunthorn Phu marubucin maye (Phra Aphai Mani) da Narin Dhibet (Nirat Narin).Tun farko dai alakar kasashen waje ta mamaye dangantakar da ke tsakanin kasashen da ke makwabtaka da ita, yayin da wadanda ke da turawan mulkin mallaka suka fara shiga ta baya.A cikin Cambodia da Laos , Vietnam ta sami rinjaye, gaskiyar da Rama II ta yarda da farko.Lokacin da tawaye ya barke a Vietnam a karkashin Rama III a cikin 1833-34, ya yi ƙoƙarin rinjayar sojojin Vietnamese, amma wannan ya haifar da rashin nasara ga sojojin Siamese.A cikin 1840s, duk da haka, Khmer da kansu sun yi nasarar korar Vietnamese, wanda daga baya ya haifar da babban tasiri na Siam a Cambodia.A sa'i daya kuma, Siam ya ci gaba da aika da yabo ga Qing China .Karkashin Rama II da Rama III, al'adu, raye-raye, wakoki da sama da duka gidan wasan kwaikwayo sun kai kololuwa.Rama III ne ya gina haikalin Wat Pho, wanda aka sani da jami'ar farko ta ƙasar.Mulkin Rama III.a karshe aka yi alama da rarrabuwar kawuna game da manufofin kasashen waje.Ƙungiyoyin masu ra'ayin mazan jiya sun nuna adawa da wani ƙaramin rukuni na masu ba da shawarar karbe fasahohin Yammacin Turai da sauran nasarorin da aka samu, wanda ya ba da shawarar keɓance mai ƙarfi maimakon.Tun da sarakunan Rama II da Rama III, da'irori masu ra'ayin mazan jiya-addini sun fi dacewa da son kai.Mutuwar Rama III a shekara ta 1851 kuma tana nuna ƙarshen tsohuwar masarautun gargajiya ta Siamese: an riga an sami bayyanannun alamun canje-canje masu zurfi, waɗanda magada biyu na sarki suka aiwatar.