WASHINGTON - Virginia's state legislature approved Thursday a bill requiring school textbooks to include the Korean name for the sea between Japan and South Korea, in a major win for Seoul.
The two key US allies, battling renewed tensions dating from imperial Japan, fought a proxy battle over the textbook change, with their respective ambassadors visiting the Southern state's capital Richmond repeatedly.
Korean American activists gained the upper hand in their effort to address historical grievances with Japan - that rouse deep passions in South Korea - at the local level in the United States.
The Virginia House of Delegates voted 81-15 to approve the measure requiring "that all textbooks approved by the Board of Education (after July 1, 2014) when referring to the Sea of Japan, shall note that it is also referred to as the East Sea."
The bill, which has already cleared the Senate, now awaits the signature of Democratic Governor Terry McAuliffe, who is widely expected to sign it into law.
Japan, which opposed the textbook change and hired a team of lobbyists to defend its position, had stressed that "Sea of Japan" was the only name for the body of water that was recognised by the United Nations and the International Hydrographic Organisation.
"Sea of Japan" was already in common usage in the world in the early 19th century, when the country had an isolationist policy and prior to Japanese colonial rule.
Koreans say the name is a legacy of Japanese colonialism, and prefer to use "East Sea."
The Virginia battle was an unenviable choice for the state, where Asian Americans are increasingly seen as a critical voting bloc for President Barack Obama's Democratic Party but where Japan is by far a larger trading partner, investing nearly US$1 billion (S$1.26 billion) in the past five years - second only to Germany.