A chart of how many countries world wide have US State Department Travel Warnings as that number varies over time.  Serves as a proxy to chart roughly how dangerous the world is as the world situation changes over time.  Perhaps not the best measure of that, but an interesting one perhaps.  Possible future enhancements would be to present this in terms of the percent of the world's land area covered by these warnings, or percent of the world's population living in those areas.

 

 

State Department Travel Warnings