Copy the “Map Tiles URL” from the bottom of the details view for the georeferenced map you’re interested in.
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Go to ArcGIS Online
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Sign in to your account.
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Click Map in the top navigation menu.
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This will open Map Viewer in a new tab.
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Click Add (usually a “+” button on the left panel).
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Select Add layer from URL.
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Click Add in the top toolbar.
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Select Add Layer from Web.
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Paste the copied Map Tiles URL into the URL field.
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For the layer type, choose Tile Layer.
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Click Next and enter Title and Attribution for the map layer.
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Click Add to map.
After the layer loads:
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The map may not automatically zoom to the correct location.
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If needed, manually pan and zoom to the geographic area of the map.
If you’re unsure where the map is located, refer to the map's position within the Historic Map Explorer and manually navigate to that area in ArcGIS Online.
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Click Save.
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Choose Save As if creating a new web map.
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Enter a title, tags, and summary.
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Click Save.