The general consensus among historians among the ones who can handle the fact that 'Lincoln' is in fact historical fiction is that we demonstrate enormous fidelity to history and that beyond that we've actually contributed a line of thinking about Lincoln's presidency that's somewhat original.
Accuracy is paramount in every detail of a work of history. Here's my rule: Ask yourself 'Did this thing happen?' If the answer is yes then it's historical. Then ask 'Did this thing happen precisely this way?' If the answer is yes then it's history if the answer is no not precisely this way then it's historical drama.
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A handful of works in history have had a direct impact on social policy: one or two works of Dickens some of Zola 'Uncle Tom's Cabin' and in modern drama Larry Kramer's 'The Normal Heart.'