U.S.-Iran affair timeline

 Iran, the United States and a Nuclear Seesaw

Far from a monolithic relationship, Iran and the United States have spent as many decades as friends as they have as enemies. And for most of the history, whatever the polarity, nuclear issues have played a role.

 

http://www.nytimes.com/interactive/2012/04/07/world/middleeast/iran-timeline.html