d3.js or Higcharts create animated US map

We need a US map created using D3.js or Highcharts library that loads a JSON file with geolocation data (latitude and longitude) for transactions and displays at a rate of approx. 1 per second as a blip or dot on a map then fades. The map will look like a more basic, slower, and US-only version of the map featured on [login to view URL] A JSON feed will be made available after the project is awarded and will consist of headers "DateTime, ID, Lat, Long, RiskScore". The RiskScore will dictate which of 5 colors will be used per dot. Thanks!