On that point, jusris, you are mistaken.  Americans of German and Austrian descent were victims of lynching between 1917 and 1920.  I'm not at all claiming the number of "white" victims was in any way comparable to those who were black during those those same years, but we're really talking about a difference of degree, not of kind.  Just so you understand, there's no such legal term as "lynching."  The crime is murder - which makes an accurate accounting hard to do.  I would say being burned at the stake or dragged behind a pickup truck until dead are as bad or worse, but they don't count as lynching to some.

Like Americans of Japanese Ancestry would experience during another war, this group was unjustly stigmatized before and after America's entry into World War I.

Look up the so-called "Sedition Act" and what it disallowed regarding free speech and the right to peacefully dissent.   The Act was no joke, and violating its precepts got you a summary prison term of five years on up.