I think if America were whiter there would be a more unified desire to intervene in Europe. As it is America is not simply European ancestry . You underestimate how much sway the Latinos and blacks have. I can tell you that they literally do not care about Ukraine or Russia... Why should they? There's no historical link, and the ones that do exist are negative.
There is a difference between white and non white Americans and their views on Russia and Ukraine. To the point where a minority of black and Latino voters believe the cost of defending Ukraine is worth it, while a majority of white voters agree