History is not just about events and trends. It is about what they mean, and that is subject to interpretation, which in turn is contingent on the historian's point of view. You can find an excellent collection of examples in The Varieties of History: From Voltaire to the Present. If you are actually interested in historiography you could go further by reading what Trevelyan, Macaulay, Thompson, Thomson, Acton et al wrote about the same period and the same location. You may scratch your head at times, wondering if they are in fact writing history concerning the same period and the same location. Then you may find it helpful to recall Carr's analogy with catching oceans, baits and fishes.But there are also things we objectively know about the past, for instance:
- when the last ice age ended
- that the agricultural revolution happened
- that the enlightenment happened
- that the human population has been growing steadily for thousands of years.
We can agree that there is objective and subjective meaning, though, no?
An apple is objectively an apple. An apple's relation to other things in certain contexts may be subjective. Global warming is objectively happening, how this event is interpreted is subjective. I'd think that the scientific method, and scientific understanding is just newly being injected into the field of history. Up until very recently the field was awash with little to no awareness of itself.
So it's not that history is ultimately subjective. What happened, to an extent, can be made objective, or as objective as possible, and in some cases it can be made completely objective. But then how that's framed depends on the subject.
This is no different from a field like biology, except that it's easier to be completely accurate in the harder sciences.