Also notably, of that list, Burkina Faso and Togo border each other, as do Tanzania and Zambia (though the acceptance dates don't line up). In the cases of Ecua

Also notably, of that list, Burkina Faso and Togo border each other, as do Tanzania and Zambia (though the acceptance dates don't line up). In the cases of Ecuador and Mauritania, how acceptance happened on one side of each of their border, but not the other, is left as an exercise to the reader (and this reader is inferring that they were refused—but both of those nations have large, porous borders, so there's any number of possibilities, many of which illicit).