For 10 points, identify the nation that defeated the United States in a namesake war.
One dynasty to rule this country was founded by Lai Thai Tho and fought a war with the Song dynasty. In addition to the Le dynasty, one kingdom in this country had its capital at Vijaya and was known as the Champa. One emperor of this country signed the Treaty of Hue as the last independent ruler of the (*) Nguyen Dynasty, Tu Duc. One Buddhist monk in this nation underwent self- immolation to protest the policies of the Catholic President Ngo Dinh Diem. The Battle of Dien Bien Phu ended French colonial rule of this Southeast Asian country unified under the communist rule of Ho Chi Minh. For 10 points, identify the nation that defeated the United States in a namesake war.
One dynasty to rule this country was founded by Lai Thai Tho and fought a war with the Song dynasty.
Socialist Republic of {Vietnam}