Question 4 • Crowley Credit Recovery US History Studies Since 1877 A
Alliance agreements often obligated countries to support and defend one another if a member was attacked. After the assassination of Archduke Franz Ferdinand, these commitments drew additional nations into the conflict, helping a regional crisis grow into World War I. So the correct choice is “Alliances required nations to defend each other against aggression.”
AI-written and checked against the verified answer.