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There are some atlases for 1890 or thereabouts on the internet archive. This one here is exactly 1890.
There are plenty of others at this link (but not necessarily 1890).
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University of Alabama has a large digital collection of historical maps grouped by region and period of publication. Here are the world maps for 1876-1900, and it's a long list with thumbnail images and publication details. But unfortunately, the image links don't work! It's really a shame this site is not maintained but with some searching you may be able to track down images on archive.org or elsewhere.
Here are a few other sites with searchable collections of historical maps, and some relevant examples I found on each with just a quick search.