With the new tax cuts for Corporations, how does that bring more jobs/money to the USA?

Is it because the tax is now more fair, and they can bring their factories back here? Or they can make more of their profits here with out getting an outrageous tax? What do they mean by making their profits here vs Ireland. Obviously, their company is here.... Give me an example please. (Source)
Update: I am not trying to start a political debate, I just literally want the answer to my question. I am not for or against the tax reform.... Not yet, at least. haha
Update 2: Will it cause them to bring their factories back here?
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