Change border width of some denominations but not others? about tigris HOT 1 CLOSED

library(tigris)
#> To enable caching of data, set `options(tigris_use_cache = TRUE)`
#> in your R script or .Rprofile.
library(tidyverse)
library(sf)
#> Linking to GEOS 3.8.0, GDAL 3.0.4, PROJ 7.0.0; sf_use_s2() is TRUE
options(tigris_use_cache = TRUE)

my_states <- states(cb = TRUE, year = 2020) %>%
  filter(NAME %in% c("Arizona", "Nevada", "California"))

my_zips <- zctas(cb = TRUE, year = 2020, filter_by = summarize(my_states))

ggplot() + 
  geom_sf(data = my_zips, fill = NA, color = "blue") + 
  geom_sf(data = my_states, fill = NA, color = "black",
          linewidth = 1) + 
  theme_void()