"This week, All Things Considered is exploring a counterfactual history of World  War I, and we invite you to participate. Use the form below to imagine how one aspect of the past 100 years would be different if Archduke Franz Ferdinand had not been killed in 1914. We will share some of the responses in a future segment."

"This summer marks 100 years since the start of World War I. Many argue that the conflict was inevitable — but what if it wasn't?"

"Without the assassination of Archduke Franz Ferdinand, there would have been no need for rulers in Vienna to threaten Serbia, no need for Russia to come to Serbia's defense, no need for Germany to come to Austria's defense — and no call for France and Britain to honor their treaties with Russia."

"What would be the ripples of this counter-history?"