Question: What does the U.S. believe caused the country where the birthplace of Yaovabha Bongsanid is located, to help Japan?

Knowledge 1: Yaovabha Bongsanid
Princess Yaovabha Bongsanid died on 13 June 1934 at the Grand Palace, at the age of 49 years and 11 months. [SEP] Knowledge 2: Grand Palace
The Grand Palace (, ) is a complex of buildings at the heart of Bangkok, Thailand. The palace has been the official residence of the Kings of Siam (and later Thailand) since 1782. The king, his court, and his royal government were based on the grounds of the palace until 1925. King Bhumibol Adulyadej (Rama IX), resided at the Chitralada Royal Villa and his successor King Vajiralongkorn (Rama X) at the Amphorn Sathan Residential Hall, both in the Dusit Palace, but the Grand Palace is still used for official events. Several royal ceremonies and state functions are held within the walls of the palace every year. The palace is one of the most popular tourist attractions in Thailand. [SEP] Knowledge 3: Pacific War
The official policy of the U.S. Government is that Thailand was not an ally of the Axis, and that the United States was not at war with Thailand. The policy of the U.S. Government ever since 1945 has been to treat Thailand not as a former enemy, but rather as a country which had been forced into certain actions by Japanese blackmail, before being occupied by Japanese troops. Thailand has been treated by the United States in the same way as such other Axis-occupied countries as Belgium, Czechoslovakia, Denmark, Greece, Norway, Poland, and the Netherlands.
Knowledge 1: Grand Palace
The Grand Palace (, ) is a complex of buildings at the heart of Bangkok, Thailand. The palace has been the official residence of the Kings of Siam (and later Thailand) since 1782. The king, his court, and his royal government were based on the grounds of the palace until 1925. King Bhumibol Adulyadej (Rama IX), resided at the Chitralada Royal Villa and his successor King Vajiralongkorn (Rama X) at the Amphorn Sathan Residential Hall, both in the Dusit Palace, but the Grand Palace is still used for official events. Several royal ceremonies and state functions are held within the walls of the palace every year. The palace is one of the most popular tourist attractions in Thailand. [SEP] Knowledge 2: Pacific War
The official policy of the U.S. Government is that Thailand was not an ally of the Axis, and that the United States was not at war with Thailand. The policy of the U.S. Government ever since 1945 has been to treat Thailand not as a former enemy, but rather as a country which had been forced into certain actions by Japanese blackmail, before being occupied by Japanese troops. Thailand has been treated by the United States in the same way as such other Axis-occupied countries as Belgium, Czechoslovakia, Denmark, Greece, Norway, Poland, and the Netherlands. [SEP] Knowledge 3: Yaovabha Bongsanid
Princess Yaovabha Bongsanid died on 13 June 1934 at the Grand Palace, at the age of 49 years and 11 months.
Knowledge 1: Yaovabha Bongsanid
Princess Yaovabha Bongsanid died on 13 June 1934 at the Grand Palace, at the age of 49 years and 11 months. [SEP] Knowledge 2: Grand Palace
The Grand Palace (, ) is a complex of buildings at the heart of Bangkok, Thailand. The palace has been the official residence of the Kings of Siam (and later Thailand) since 1782. The king, his court, and his royal government were based on the grounds of the palace until 1925. King Bhumibol Adulyadej (Rama IX), resided at the Chitralada Royal Villa and his successor King Vajiralongkorn (Rama X) at the Amphorn Sathan Residential Hall, both in the Dusit Palace, but the Grand Palace is still used for official events. Several royal ceremonies and state functions are held within the walls of the palace every year. The palace is one of the most popular tourist attractions in Thailand. [SEP] Knowledge 3: United States declaration of war on Japan
On December 8, 1941, the United States Congress declared war (Public Law 77 - 328, 55 STAT 795) on the Empire of Japan in response to that country's surprise attack on Pearl Harbor the prior day. It was formulated an hour after the Infamy Speech of US President Franklin D. Roosevelt. Japan had sent a message for the United States to its embassy in Washington earlier, but because of problems at the embassy in decoding the very long message -- the high security level assigned to the declaration meant that only personnel with very high clearances could decode it, which slowed down the process -- it was not delivered to the U.S. Secretary of State until after the Pearl Harbor attack. Following the U.S. declaration, Japan's allies, Germany and Italy, declared war on the United States, bringing the United States fully into World War II.

Answer: blackmail