1 Many are children. Children can’t vote.
2. Many (if not most) of those are coming from socialist dominated regimes that they can’t stand. Based on most recent immigrants from those countries, they are hard workers who wish to keep the money they make and not turn it over to the government. While some people such as Trump who was openly anti-Hispanic (calling all Mexicans “rapists”) could scare them into being Democrats, many will end up as Republicans.