How can I find out what actually killed my uncle in World War 2 with a status of DNB?

How many wars has the US won? What font is used for military? Which Commandant of the Marine Corps was relieved of his duties? What country sent reinforcement in the form of Division Azul to aid Germany in its World War 2 attack on the soviet union? What year did Phil Knight start selling air force ones? Did minutemen get paid? Why was the life for southern women during the war difficult? What did Germany do to cause great Britain and France to declare war on them? What president said one could trail my army by the blood from their ragged feet? During 1939 the first heinkel HE111 shot down in britain? Slovakia Hungary and the Czech Republic are all concerned about the protection and rights of which group in each other's nations? Why did the Muslim armies conquer Persia Syria Damascus Jerusalem and Egypt? How much did the 18th century sailors get paid? What did hush-hush mean in world war 2? Washington felt you should remain neutral in world affairs? What was the Turks nickname in World War 1? When did china change its flag? Where was the battle site on Luzon Island? What did Tecumseh do to fool the British? What horse won the Oaks in 1980?