The financial situation at the beginning of the reign of King Rama III was poor. Funds were inadequate for state expenditure, therefore the king reorganised the Port Department which was responsible for the collection of port fees, an appreciable portion of state income. One of the most significant achievements was to revive the nation’s economy by trading with foreign countries. He constructed ships patterned after Chinese Junks and traded directly with foreign countries, especially China This brought a large income to the country.
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พระจอมเกล้าเป็นพระมหากษัตริย์ไทยคนแรกที่จะเปิดกว้างให้เปิดเผยอิทธิพลตะวันตกและความคิด เขาสร้างความสัมพันธ์ทางการทูตกับยุโรปและอเมริกาและเปิดประเทศที่จะฟรี การจราจรของการค้าต่างประเทศ เขาได้รับการยอมรับเสรีภาพในการนับถือศาสนาเป็นสิทธิมนุษยชนขั้นพื้นฐานและได้รับการสนับสนุนในการให้บริการที่นับถือศาสนาคริสต์ศาสนาของพวกเขาและผลงานทางการแพทย์ รับโอกาสนี้พระบาทสมเด็จพระเจ้าอยู่หัว แนะนำการศึกษาภาษาต่างประเทศโดยเฉพาะอย่างยิ่งภาษาอังกฤษไปยังประเทศไทย การเจรจาต่อรองไหวพริบของเขา ทำให้มั่นใจได้ว่าประเทศไทยยังคงเป็นอิสระเพียงอย่างเดียว พระจอมเกล้าเข้าเยี่ยมชมคนของเขาทั่วประเทศและ ช่วยให้ชีวิตของพวกเขาดีขึ้น
King Rama IV was the first Thai monarch to be openly receptive to Western influences and ideas. He established diplomatic relations with Europe and America and opened the country to the free traffic of foreign commerce. He accepted the freedom of religion as a basic human right and encouraged the Christian in their religious services and medical works. Taking this opportunity, the King introduced the studies of foreign languages, especially English, to Thailand. His tactful diplomacy ensured that Thailand alone remained independent. King Mongkut visited his people nationwide and helped better their lives
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One of the most important events in Thai history occurred during King Rama V's reign: the abolition of slavery. The King intended to abolish this system immediately, but he could not carry it out. He realised that it must be done gradually. Slavery was finally abolished although it took about 30 years.
King Chulalongkorn also travelled extensively throughout the country, often openly, sometimes incognito, to personally investigate and share his subjects' conditions and aspirations with his people. After coming back from visits to foreign countries, King Rama V realised that Thailand needed to be decentralized from Bangkok. He built Dusit Palace and increasingly constructed roads, namely Ratchawithi, Si Ayutthaya, Rama V and Sam Saen. Among all the roads he constructed, Tanon Ratchadamnoen was the widest and most beautiful Avenue in Bangkok where trees, Tamarindus indica and Mahogany were planted. Canals were dug and bridges were built to increase the convenience of transportation to the people
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famous public school, and received a special military training at Sandhurst and through service with several British infanty and artillery units In 1900, he attended Oxford University, Christ Church College, where he studied history, administration and law. He proved himself more English than the other people in Thailand. This was the reason for the growing influence and popularity of the British in Thailand. The capable King Vajiravudh succeeded to the throne on 23 October in 1910. His modern ideas brought up Thailand to advanced stages in social development and western civilisation. king Rama VI continued his father's and grandfather's reforms.The King organised the state administration, he established the Mimstry of the Royal Navy, separate from the Ministry of Defence, set up the ministry of Commerce and changed the name of the Ministry of Religious Affairs (Thammakam) to the Ministry of Education.
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In 1932, Thailand faced with the economic and political crisis which affected the country through the world slump or depression. Dissidence gradually increased and on June 24, 1932 almost 700 years of absolute monarchy in Thailand terminated with a bloodless coup d' etat organised by middle level civil servants and military officers. A revolution to set up a new regime had been considered by Luang Phibun Songkhram, a young army officer, and Dr. Pridi Banomyong, a young lawyer and Phraya Phahol Phonphayuhasena on behalf of the People's Party