Which event caused the united states to lead a war in afghanistan? a. the isis attacks on iraq b. the civil war in syria c. the september 11, 2001, attacks on new york and washington, d. c. d. the attacks by hamas on israel why did the cold war spread to vietnam and korea? a. the chinese were interfering with the governments there. b. the soviet union had installed pro-soviet governments there. c. communist governments had taken over the northern parts of the countries. d. cuba made agreements with the countries for protection. which of the following contributed to the end of the cold war? a. the fall of the south vietnamese government b. the reunification of the koreas c. the end of the u. s. nuclear weapons program d. the reform of the soviet government