Question: Which of the following is true of the NATO alliance? Need Assignment Help? Group of answer choices NATO has undergone only one round of enlargement since the end of the Cold War, extending membership to former rivals. NATO established a rapid-reaction force in response to Russia's increasing hostility. The United States and its European allies have been discussing the dissolution of NATO and the Europeanization of Western security. The NATO alliance played a pivotal role in the war in Iraq.