You didn’t know about those either. You were taught it by someone else, who learned about it from someone else, and so on. Sure some people discovered things along the way but you specifically don’t get credit for their progress. Does that make you ignorant? What about all the things that those people did discover or invent - surely you can see how the progress they made at that time, with so few resources and advancements, was truly revolutionary. Some of those advancements were far harder and significant than the stuff we like to point at in modern times like rockets.
Credit? Screw credit, that's not what I'm talking about. By accident, good ideas wander into our minds and make us smart. OK, there's some amount of positive feedback in this process (ideas about how to accumulate more good ideas). But "ignorance" means being uninformed, that is, not lucky enough to be inhabited by many of these good ideas in the first place. And there's a lot more of them floating around in modern times, and so it's harder to be ignorant, and easier to be lucky, and well-informed, and since ideas help with being a smarty-pants, it's easier to stumble into being smart. Thus ancient people were stupid, in a manner of speaking.
