would nationalit leaders include the US? you'd have to do stuff on Johnson's policies, like domino theory and the choice of "defending the free world against Communism" over domestic policies, and Nixon's Vietnamisation. Also, Diem's repressive regime, then the the later leaders, of course Ho Chi Minh and how he was such an inspirational leader for the North Vietnamese, possibly even Pol Pot becuase it was because of his regime that later conflict hapened in Cambodia