History should be taught accurately and truthfully. There should be no political bias in history, just the facts.
The real problem is that liberals lie about the facts of history, because the facts do not support their agenda.
First history is not about just "facts".
Second, no one can write an "unbiased" history. The best we can do is be aware for our biases and try to correct for them.
Third, most of the "junk history" of the last 50 years comes from the right, from Holocaust deniers to Southern revisionists, to American exceptionalists.
I would recommend Jim Loewen's "Lies my Teach Told Me", if you want an academically reputable treatment of the subject of teaching history.
Are you crazy? HIstory IS facts. Facts have no agenda. History should be taught as it actually happened, not as anyone wishes it had been.
The purpose of teaching history is so that we can learn from it and not repeat the mistakes of the past.
As to your stupid comment about 'junk history', historical revisionists are mostly left wingers and members of the teachers union, they are not teaching history, they are trying to indoctrinate liberal bullshit philosophy into young brains.
The holocaust happened, slavery happened, America is an exceptional nation. And you are full of shit.