Root beer is comprised of several herbal flavorings, primarily sassafras. Most early medicines were also of herbal origin, which is why some have similar flavors. Many sodas that exist today were in fact originally created as medicinal elixirs.
There is certainly a racist bent to some Republicans' anti-immigration rhetoric. However, this does not invalidate opinions on strong immigration policies. In fact, Democrats have lately been making Republicans look downright reasonable by comparison.
The US--and literally every other country on the planet--has immigration laws for good reason. We cannot allow people, regardless of race or nationality, to enter our country without being vetted and without some evidence that they would be an asset to our country. Where those lines should be drawn is a subject up for debate, but it is laughable to suggest that the US should simply open its borders and allow anybody to cross unchecked. The idea that government agents should only enforce laws that they personally agree with, or should be able to stop doing their jobs entirely, is insane.
I disagree with much of our immigration policy, and I wish there were a clearer, easier path to citizenship for those who qualify. The way to improve this is to vote for progressive candidates, and to be active in encouraging positive reform. Supporting candidates who promise simply to ignore or violate laws is irresponsible and reprehensible. This problem is made no better by branding the opposition as racists, even when the accusation is true.