[underlipton]

Your understanding of what constitutes genocide is mistaken. It's not just murder. Any widespread or systematic attempt to remove an ethnic group from existence in a particular region counts, even if it's not successful or doesn't result in massive loss of life, if the intent is to disrupt that ethnic group's ability to sustain itself. Forced removal falls under this, as does ethnic reeducation. Japanese internment during WWII was arguably a genocidal act because its character as an act of ethnic cleansing (even if temporary, in hindsight) is often a first step to outright extermination. Thankfully, the war went well for America, and we felt no need to succumb to dangerous impulses; however, should Midway or other engagements have not gone well, or had the war been drawn out, putting a strain on resources, you would have seen starvation rates rise in the camps, at the very least.

You're making distinctions in service of, "Well, we weren't THAT bad," but generally, I would think the nominal international champion of freedom and justice would want to stay away from even the whiff of such things.