Instead of telling students how the relationship between America and the Soviet Union broke down after WWII, why not let them try to piece it together themselves? This is a great activity that really gets students engaged and excited as they piece together documents like a puzzle. The documents are in chronological order and require a little background knowledge but not much. You can alter the writing activity as you please, but students love comparing their interpretations and theories with each other, and often come to conclusions that are very close to the real story. Even better, they pay rapt attention when you unveil the true story in order to see what they got right and wrong.