如何使用谷歌地图为国家着色？

<div id="map" style="width: 100%; height: 500px;"></div>

function initMap() {
  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 4,
    center: { lat: 24.886, lng: -70.268 },
    mapTypeId: 'terrain'
  });

  var countries = new google.maps.FusionTablesLayer({
    query: {
      select: 'geometry',
      from: '1N2L-9Nk9bZ-j9eK40J7JmSD3mGF2IJWaT