如何在R Studio中绘制阿根廷各州的地图并覆盖地图

install.packages(c("maps", "mapdata", "ggplot2", "rgeos", "maptools", "rgdal", "sp", "sf"))

library(rgdal)
argentina_map <- readOGR(dsn = "path_to_shapefile_folder", layer = "shapefile_name_without_extension")

library(ggplot2)
ggplot() +
  geom_polygon(data = argentina_map, aes(x = long, y = lat, group = group), fill = "lightblue", color = "black") +
  coord_equal()

ggplot() +
  geom_polygon(data = argentina_map, aes(x = long, y = lat, group = group), fill = "lightblue", color = "black") +
  geom_polygon(data = state_data, aes(x = long, y = lat, group = group), fill = "red", color = "black") +
  coord_equal()

ggplot() +
  geom_polygon(data = argentina_map, aes(x = long, y = lat, group = group), fill = "lightblue", color = "black") +
  geom_polygon(data = state_data, aes(x = long, y = lat, group = group), fill = "red", color = "black") +
  coord_equal() +
  labs(title = "阿根廷各州地图") +
  theme(plot.title = element_text(hjust = 0.5))