us_outline = {
let outline = await FileAttachment("outline.json").json();
let polygon = outline.features[0].geometry.coordinates[5];
polygon[0].reverse();
outline.features[0].geometry.type = "Polygon";
outline.features[0].geometry.coordinates = polygon;
let w = 600;
let h = 400;
let projection = d3
.geoMercator()
.reflectX(true)
.fitExtent(
[
[0, 0],
[w, h]
],
outline
);
let path = d3.geoPath().projection(projection);
return path(outline);
}