Being under educated does not mean you are a stupid person. There could be many reasons for a person's lack of higher education. But overall your post is well thought out and right on. Trump is appealing to a wide base of voters more so than any other candidate. Which if you stop and think about it, is a smart thing to do.
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The charts do not show as large a decline as you seem to indicate. A decline for sure. But there are still a ton of illegals here. I am well aware of illegals here, working out in the fields with them on farms when I was young. It is cheap labor. But none of that takes away the fact we have laws and why have a law if you are not going to enforce it? A country needs to have borders and protect them.