chart = Choropleth(unemployment, {
id: d => d.id,
value: d => d.rate,
scale: d3.scaleQuantile,
domain: unemployment.map(d => d.rate),
range: d3.schemeBlues[9],
title: (f, d) => `${f.properties.name}, ${statemap.get(f.id.slice(0, 2)).properties.name}\n${d?.rate}%`,
features: counties,
borders: statemesh,
width: 975,
height: 610
})