The series was originally meant to be set in a then contemporary 1985, but Waldrop, who was to write the first story, insisted that his story take place right after World War II. This created a forty-year gap between the first chapter and the remaining stories, pushing later contributions to fill in the intervening decades. Martin noted that this forced the authors to write about events they would have otherwise ignored, particularly the House Un-American Activities Committee and the McCarthy hearings which gave rise to characters and plot points that "added immeasurable richness to our world and depth of our characters". Waldrop's story also forced Williams to rewrite a new story, "Witness", which became the only shared world story to appear on the final ballot for a Nebula Award.