How were Asian Americans soldiers treated during World War 2, Korean War, and Vietnam?

I know this may sound dumb, but I have never seen an Asian American soldier in any picture or movie. I mean, do y'all recall seeing an Asian American solider in Full Metal Jacket, Saving Private Ryan, etc? Is there a reason for this, or...? I'm just curious.

During the Industrial Age, plenty of immigrants settled in the booming cities to find jobs and lived in immense poverty. However, if working in industry was so money-less for the workers, how did the lower class among the "native" population (or essentially the decedents of earlier immigrants from the colonial times up to the Industrial Revolution) of the United States fair? I feel like they get excluded from the discussion regarding the Industrial Age. I've even read How the Other Half Lives, but I don't really recall any mention of lower class people who were not immigrants. I guess I have a broad question relating to the middle class and lower class of the time with respect to non-immigrants. What were their jobs? Surely there must have been more than just the factories, mining coal, or farming.

Smoking science is still pretty new and now we know all the stuff that happens when you smoke, a lot less people have picked it up/quit. But before that smoking seemed to be something literally everyone did. So my question is that since pretty much everyone smoked, how common was lung cancer/other smoking related illnesses?

The Nazis are pretty universally considered to be the "bad guys" of WW2 today. Would a citizen of a neutral country also consider them to be morally inferior compared to UK or Soviet? How much did the publication of the details on concentration camps affect public opinions? Perhaps a better way to ask this is would be: ignoring pragmatism, would they feel ethically obliged to help the allies over axis, given what they know?

Mainly looking for answers for neutral nations, such as Switzerland or Sweden, or countries that didnt have extensive resistance, e.g. Denmark.

German and Japanese crytography protocols were compromised early in WW2, giving the Allies a major advantage. Does this demonstrate extraordinary incompetance on the part of the Axis, extraordinary competence on the part of the Allies, or something in between?

Or if they did, why aren't there German-speaking countries in Africa or the Americas, the way there are English, French, Spanish, or Portuguese?

I don't have a preference on regions, although I do prefer Europe.

I know that ends up being more vague than it seems, but like, a fairly "modern" clock with two 'hands' and all (or similar, if there are other historically used methods of telling time I'm not aware of).

And by "Have access to" I mean that the average person could reach a clock within 5 minutes or so of where they were or lived. But I'd take really any info on the subject I'm curious. They seem like such a basic thing but it seems like even 150 or so so years ago they would be the most intricate thing in most homes.

Could someone explain the line by line tactic? I never understood it.

I've never found a good source for it, but I've read that Francis Swamp Fox Marion was the father of guerilla warfare/ special operations in the US. By that I mean, he used unconventional tactics like not waiting in line to be shot in the face, and attacking at night in small groups on the flanks, or assassination of officers then retreating.

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I would really like to know about this. I think the guy they saved was a farmer or something like that. I'm sorry I don't have any more information than that.

Thanks for the help!