Answer:
Based on the information provided, the statement that best explains the purpose of this map is: "The United States was the target, but the effects of the 9/11 attack were felt worldwide by countries who lost citizens."
The map is labeled with the number of 9/11 victims by country, indicating that the impact of the attack was not limited to the United States alone. By highlighting the number of countries affected and the loss of citizens in each country, the map emphasizes the global nature of the tragedy and the widespread impact it had beyond U.S. borders. This suggests that the purpose of the map is to acknowledge and recognize the international scope of the 9/11 attack and its consequences.