While it's certainly true that history as taught in schools often has an explicitly societal and nationalist agenda of some sort, the vast majority of academic history books are not written in an aggressively "us vs them" style. All of them, however, have points of view, and none is free of "bias".

For an explanation of why this is, and why it's actually a good thing, you might want to check out these earlier responses to similar questions – though, as always, there is always more to say and we encourage fresh responses to your query:

On Unbiased history sources with me, u/mikedash

and

How can I, an average guy without huge amounts of historical knowledge, learn the truth when the subject is controversial and heavily influenced by propaganda? with u/Georgy_K_Zhukov