Not sure if this is the right place, but I cannot figure this out. Illustrator Pathfinder question.

I have a black and white, two colored file in illustrator using many layers and shapes. Is it possible to create one layer with one object/group with only black and get rid of the white, without using pathfinder on each individual layer.

I've tried selecting all and merging in pathfinder, then selecting white and deleting all of those shapes, but it isn't too exact. I have some thin lines that become even thinner when doing that and it does not look right.

Is it possible to like, save one color only as a separation, or to flatten all the layers and then select and delete the white?

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