About "it"? What is "it"? History? You're saying nothing in History has ever been made up? Right.
Not modern history. No.
Modern History being what?
Wikipedia suggests 16th Century onwards.
Take the Iraq War. How many people died in the Iraq War and post war period? 300,000 or 1 million? Or something in between?
Perhaps people will just pick and choose and make up a figure that's convenient for their argument.
Why did the US go to war? Do we know enough to be able to say why the US went to war? Or do some people make stuff up?