In other words, where is the Ukrainian, “Anne Frank”?
Not the best example, since her book was first published in 1947, and only published in English in 1952.
Prior to the war, however, there had been lots of Jews living in the US, and they lobbied on behalf of Jews being persecuted in Europe, though to little effect. In the case of both them and the Armenians persecuted during their genocide, earlier, there had been some sympathetic Americans, but not enough to sway popular opinion.