library("maps")
library("ggplot2")
us <- fortify(map_data("state"), region = "region")
gg <- ggplot() +
geom_map(data = us, map = us,
aes(x = long, y = lat, map_id = region, group = group),
fill = "white", color = "black", size = 0.25) +
coord_map("albers", lat0 = 39, lat1 = 45) +
theme_map()
gg
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