User should be able to add other shape file layers superimposed on the US map (e.g. roads, rivers, temperature data, etc.).
One way this could work is as follows:
roads <- # load shape file...
plot_usmap("counties") +
add_layer(roads) +
add_layer(...)
# etc.
This could work by applying the same spTransform that was applied to the original US map data to the layers passed through to plot_usmap.
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