
“You’re talking about Vietnam and at that time nobody had ever heard of the country.”
Trump was describing the US knowledge about Vietnam in 1968, when about one half million US troops were stationed in Vietnam, as quoted in [Trump says was 'never a fan' of Vietnam War, and that Americans hadn't heard of country in 1968, Japan Times, https://www.japantimes.co.jp/news/2019/06/06/world/politics-diplomacy-world/trump-says-never-fan-vietnam-war-claims-americans-hadnt-heard-country-1968/#.XraZ4hMzbOQ]
2010s, 2019, June