This interactive visualization compares the 2020 presidential election results against the 2016 election, presenting two choropleth maps of the United States. The top map shows the 2020 margin between Biden and Trump, while the bottom map displays the 2016 margin between Clinton and Trump, with states colored on a blue-purple-red scale. Built with D3 v5, it uses `d3.geoAlbersUsa()` for the map projection and `d3.geoPath()` to render state boundaries. Vote totals are aggregated from county-level data provided by The New York Times for 2020 and the US_County_Level_Election_Results_08-20 dataset for 2016.