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.
As I have said for many years throughout this land we're borrowing money from China to buy oil from the Persian Gulf to burn it in ways that destroy the future of human civilization. Every bit of that has to change.