America is a country of immigrants, and as someone who lived, worked, or visited 30+ countries, I can assure you that Americans are the most accepting of immigrants. Legal ones, that is.
I tend to agree, although I'm not an American myself (my country did 'sell' New York to the Americans of yonder years), that immigration is one of the determining (success) factors of the USA as we know it today. However, I also do not underestimate the issues with the original Native Indian inhabitants, as I also do no deny the issues (obviously by today's standards, in hindsight, but nonetheless) of my home country's colonial history!
However, because of that, I am a bit (just a bit) surprised by the level of bigotry that still exists today (even after a relatively short period, on a cultural scale), although I do understand that populism feeds (and preys) on primitive sentiments (bringing out the worse / most primitive of 'underbelly' feelings). So Trump is very effective in mobilizing that, his tactics are effective.
Again however, what does it tell us. that a candidate for (no less) the office of President of the USA, needs to resort to such
tactics. So far, he has not shown great insights or a clear analysis (which is bound to have some nuances in it somewhere, if he's honest) of the issues that face the USA, or the world for that matter (in its role as a world power, if at least for the benefit of the home nation).
From what I've seen and heard of him, he's
not very strong in demonstrating that he even can understand or actually maneuver a path through the international minefield of diplomacy and consensus, getting fundamental support for his ideas (for the benefit of the nation's needs, not his own). It obviously also depends on the choice of members of cabinet, and the wiggle room they are given. So if solecism, or at best unilateralism (if he knows the difference), is his simplistic solution, he's a bad choice (no matter the support he can buy).
Whether Hillary Clinton is a better choice, and hence off-topic, is a completely different question. I tend to think she's more experienced though (less damage is also a benefit), if I were given the choice (which is not given to me, but to the American People). They'll get the president they deserve ...
Cheers,
Bart