Edit in JSFiddle

$.ajax({
    dataType: "jsonp",
    url: 'http://countriesfor.us/api/?country=de',
    success: function(data) {
        var de = data;
        
        for (var i = 0; i < de.divisions.length; i++) {
            $('.germany').append('<option>' + de.divisions[i] + '</option>')
            console.log(de.divisions[i]);
        };
    }
});

<h1>Germany</h1>
<select class="germany"></select>