Summary: If you extend the current fiscal and economic trend lines, by 2040 the United States will be in no way the leading nation much less the only real superpower. David Walker postulates that we may not be a superpower at all. He's published a book laying it all in detail. The former comptroller general joined Federal Drive with Tom Temin to talk more. Learn more about your ad choices. Visit megaphone.fm/adchoices
