
If it is applied widely enough that it begins to actively make that ethnicity less common, particularly if it’s applied regardless of immigration status. I think a good metric for this case would be widespread deportation of legal immigrants of certain ethnic groups and the telltale indicator would be widespread deportation of citizens based on ethnicity alone.
Because in this particular context ethnic cleansing can’t be effective if it is only applied against illegal immigrants. That’s the thing which makes it ethnic cleansing, it’s about trying to rid everyone of that ethnicity. I think the illegal immigration crackdowns are driven by the same racism and xenophobia as ethnic cleansing, but it hasn’t yet reached that state if legal immigrants and citizens of that ethnicity aren’t being deported at a large scale.
“Illegal immigrants” isn’t an ethnicity. The illegal immigrants being targeted tend to be from certain ethnicities and white illegal immigrants aren’t being targeted as much, but ethnic cleansing has to be facilitating ethnic homogeneity. This could not be achieved in the United States unless legal immigrants and citizens of the target ethnicities are also deported en masse.