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Not entirely made up. Some of the late first temple period can be verified. Such as the split between the northern and southern kingdoms, or the Assyrian invasion under Hezekiah. The further you go back, though, the worse the evidence gets. David and Solomon are questionable as historical figures, and anything before that, just forget it. The Egyptian exile never happened.
Made up, for a given value of made up. They weren’t completely inventing things whole cloth, and had some surviving material to work off of. That and Babylonian records. They had those too. Since Babylon was gone… Well, finders keepers.