When did this country exist, and what came before and after it? Reads the bundled historical_codes crosswalk in both directions – so it answers both "what did the USSR become" and "what was Estonia part of".
Arguments
- x
Country names or codes, current or historical (
"USSR","Yugoslavia","Estonia","DEU").- origin
How to read
x(default"country.name").- warn
Whether to report inputs that match neither a historical entity nor a modern country (default
TRUE), asdissolve_country()does.
Value
A tibble, one row per input: input, iso3c, country,
dissolved (the year it ceased to exist, or NA if it still does),
predecessors and successors (list-columns of iso3c codes). An input
that resolves to neither spine keeps its input and gets NA elsewhere;
with warn = TRUE it is reported rather than left to be spotted.
Why the two directions are not mirror images
Both columns hold codes, so an entity ISO never coded cannot appear in
either. ISO 3166-3 only records changes from 1974 on, and three entities in
historical_codes predate it: the United Arab Republic (1961), Tanganyika
and Zanzibar (both 1964). Asking about one of those by name works –
country_timeline("Tanganyika") gives TZA as a successor, because the
table stores that side as a name – but the reverse does not:
country_timeline("TZA") reports no predecessors, since there is no code to
report. The other eleven entities carry codes and round-trip in both
directions. Naming them instead of coding them would break the column's
type; inventing codes for them would be a guess, which this package does
not make.
Examples
country_timeline(c("USSR", "Estonia", "France"))
#> # A tibble: 3 × 6
#> input iso3c country dissolved predecessors successors
#> <chr> <chr> <chr> <int> <list> <list>
#> 1 USSR SUN Soviet Union 1991 <chr [0]> <chr [15]>
#> 2 Estonia EST Estonia NA <chr [1]> <chr [0]>
#> 3 France FRA France NA <chr [0]> <chr [0]>