Question: What year did the country where Ercole Manfredi was born form an alliance with Japan?

Knowledge 1: Ercole Manfredi
He made significant career progress through the court of King Vajiravudh, but left government office to work privately as the country was going through political change which abolished absolute monarchy and decreased government employment of foreigners. However, by adopting a Thai identity and way of life, marrying a Thai woman and settling down permanently, Manfredi remained a relevant and respected figure in Thai architecture, and later became a lecturer at Chulalongkorn University. His works include various royal residences and public institutions, ranging in style from Venetian Gothic to modernist, and incorporated Thai traditional styles as well. He contributed to much of Bangkok's architectural heritage, but no complete records of his works were kept. [SEP] Knowledge 2: Pacific War
The Axis states which assisted Japan included the authoritarian government of Thailand in World War II, which quickly formed a temporary alliance with the Japanese in 1941, as the Japanese forces were already invading the peninsula of southern Thailand. The Phayap Army sent troops to invade and occupy northeastern Burma, which was former Thai territory that had been annexed by Britain much earlier. Also involved were the Japanese puppet states of Manchukuo and Mengjiang (consisting of most of Manchuria and parts of Inner Mongolia respectively), and the collaborationist Wang Jingwei regime (which controlled the coastal regions of China). [SEP] Knowledge 3: Bang Bon District
Bang Bon (Thai: บางบอน, pronounced [bāːŋ bɔ̄ːn]) is one of the 50 districts (khet) of Bangkok, Thailand. Its neighbours, clockwise from north, are Bang Khae, Phasi Charoen, Chom Thong, and Bang Khun Thian districts of Bangkok, Mueang Samut Sakhon District and Krathum Baen District of Samut Sakhon Province, and Nong Khaem District of Bangkok.
Knowledge 1: Ercole Manfredi
He made significant career progress through the court of King Vajiravudh, but left government office to work privately as the country was going through political change which abolished absolute monarchy and decreased government employment of foreigners. However, by adopting a Thai identity and way of life, marrying a Thai woman and settling down permanently, Manfredi remained a relevant and respected figure in Thai architecture, and later became a lecturer at Chulalongkorn University. His works include various royal residences and public institutions, ranging in style from Venetian Gothic to modernist, and incorporated Thai traditional styles as well. He contributed to much of Bangkok's architectural heritage, but no complete records of his works were kept. [SEP] Knowledge 2: Pacific War
The Axis states which assisted Japan included the authoritarian government of Thailand in World War II, which quickly formed a temporary alliance with the Japanese in 1941, as the Japanese forces were already invading the peninsula of southern Thailand. The Phayap Army sent troops to invade and occupy northeastern Burma, which was former Thai territory that had been annexed by Britain much earlier. Also involved were the Japanese puppet states of Manchukuo and Mengjiang (consisting of most of Manchuria and parts of Inner Mongolia respectively), and the collaborationist Wang Jingwei regime (which controlled the coastal regions of China). [SEP] Knowledge 3: Great power
Over time, the relative power of these five nations fluctuated, which by the dawn of the 20th century had served to create an entirely different balance of power. Some, such as the United Kingdom and Prussia (as the founder of the newly formed German state), experienced continued economic growth and political power. Others, such as Russia and Austria-Hungary, stagnated. At the same time, other states were emerging and expanding in power, largely through the process of industrialization. These countries seeking to attain great power status were: Italy after the Risorgimento, Japan after the Meiji Restoration, and the United States after its civil war. By the dawn of the 20th century, the balance of world power had changed substantially since the Congress of Vienna. The Eight-Nation Alliance was a belligerent alliance of eight nations against the Boxer Rebellion in China. It formed in 1900 and consisted of the five Congress powers plus Italy, Japan, and the United States, representing the great powers at the beginning of 20th century.
Knowledge 1: Ercole Manfredi
He made significant career progress through the court of King Vajiravudh, but left government office to work privately as the country was going through political change which abolished absolute monarchy and decreased government employment of foreigners. However, by adopting a Thai identity and way of life, marrying a Thai woman and settling down permanently, Manfredi remained a relevant and respected figure in Thai architecture, and later became a lecturer at Chulalongkorn University. His works include various royal residences and public institutions, ranging in style from Venetian Gothic to modernist, and incorporated Thai traditional styles as well. He contributed to much of Bangkok's architectural heritage, but no complete records of his works were kept. [SEP] Knowledge 2: Bang Bon District
Bang Bon (Thai: บางบอน, pronounced [bāːŋ bɔ̄ːn]) is one of the 50 districts (khet) of Bangkok, Thailand. Its neighbours, clockwise from north, are Bang Khae, Phasi Charoen, Chom Thong, and Bang Khun Thian districts of Bangkok, Mueang Samut Sakhon District and Krathum Baen District of Samut Sakhon Province, and Nong Khaem District of Bangkok. [SEP] Knowledge 3: Great power
Over time, the relative power of these five nations fluctuated, which by the dawn of the 20th century had served to create an entirely different balance of power. Some, such as the United Kingdom and Prussia (as the founder of the newly formed German state), experienced continued economic growth and political power. Others, such as Russia and Austria-Hungary, stagnated. At the same time, other states were emerging and expanding in power, largely through the process of industrialization. These countries seeking to attain great power status were: Italy after the Risorgimento, Japan after the Meiji Restoration, and the United States after its civil war. By the dawn of the 20th century, the balance of world power had changed substantially since the Congress of Vienna. The Eight-Nation Alliance was a belligerent alliance of eight nations against the Boxer Rebellion in China. It formed in 1900 and consisted of the five Congress powers plus Italy, Japan, and the United States, representing the great powers at the beginning of 20th century.

Answer: 1941