#' Cartographic boundary files from the U.S. Census Bureau
#'
#' The U.S. Census Bureau provides
#' \href{https://www.census.gov/geo/maps-data/data/tiger-cart-boundary.html}{cartographic
#' boundary files} for current U.S. boundaries. The datasets in this package
#' provide a selection of boundaries from the 2020 Census files. They are
#' objects of class \code{sf} from the
#' \href{https://cran.r-project.org/package=sf}{sf package}. They are intended
#' to be used with the functions in the \code{USAboundaries} package, but the
#' data objects can also be used on their own. The data attributes associated
#' with these boundaries are unchanged from what is available in the Census
#' boundary files, with the exception that \code{state_name} and
#' \code{state_abbreviation} columns have been added where necessary for
#' convience in filtering the boundaries.
#'
#' @details The following objects are included in this package:
#'
#' \describe{\item{congress_contemporary_hires}{Congressional district
#' boundaries for the 116th Congress, 1:500k resolution.}
#' \item{congress_contemporary_lores}{Congressional district boundaries for
#' the 116th Congress, 1:20m resolution.}
#' \item{counties_contemporary_hires}{County boundaries, 1:500k resolution.}
#' \item{counties_contemporary_lores}{County boundaries, 1:20m resolution.}
#' \item{states_contemporary_hires}{State boundaries, 1:500k resolution.}
#' \item{zipcodes}{Centroids of Zip Code Tabulation Areas (2019).} }
#'
#' See the
#' \href{https://cran.r-project.org/package=USAboundaries}{USAboundaries
#' package} for low-resolution state boundaries and for the functions to
#' access this data.
#'
#' @references U.S. Census Bureau,
#' \href{https://www.census.gov/geo/maps-data/data/tiger-cart-boundary.html}{Cartographic
#' Boundary Shapefiles} (2020).
#'
#' See the U.S. Census Bureau's
#' "\href{https://www.census.gov/geo/reference/geoidentifiers.html}{Understanding
#' Geographic Identifiers (GEOIDs)}" and their
#' "\href{https://www.census.gov/geo/reference/geocodes.html}{Geographic
#' Codes}" pages for the details of this attribute data.
#' @name census_boundaries
#' @rdname census_boundaries
NULL
#' @name congress_contemporary_hires
#' @rdname census_boundaries
NULL
#' @name congress_contemporary_lores
#' @rdname census_boundaries
NULL
#' @name counties_contemporary_hires
#' @rdname census_boundaries
NULL
#' @name counties_contemporary_lores
#' @rdname census_boundaries
NULL
#' @name states_contemporary_hires
#' @rdname census_boundaries
NULL
#' @name zipcodes
#' @rdname census_boundaries
NULL
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