Thanks for the explanations, some reasons are clear to me, but some are absolutely ridiculous, for example:" they believe will eventually swell their voting base." - Is there really such a reasoning?)))
In any case, this seems to me too ridiculous and absurd a problem for such a strong country...
It's really not that absurd in our political structure. Black people, for instance, have historically voted very heavily democrat. The Republicans would argue that much of that is because under democrat administrations, that population gets more free stuff courtesy of taxpayers.
The democrat reasoning for southern immigrants is that if they encourage illegal immigration, give the illegal immigrants money, housing, etc (which they are currently doing), then wave a magic wand and give them all amnesty and citizenship, that this group will vote democrat in thanks.
Whether that would work or not is debatable, I suppose. Further, there can be unintended consequences, such as currently, the traditionally black population isn't really happy about another group getting preferential treatment, and many of them are switching to vote Republican.