For centuries they ignored America (4)

I believe the answer is:

maps

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'for centuries' is the definition.
Although both the answer and definition are plural nouns, I don't understand how they can define each other.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for maps that I've seen before include "Charts" , "Diagrams of geographical areas" , "Plans" , "Plots" , "Books of maps" .)

I've seen this clue in The Globe and Mail and The Guardian.

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