Answer :
Number 1: "the systematic killing of Jews by Nazis"
Number 2: "Millions died in German death camps."
Number 3: "An invasion of Japan would cost hundreds of thousands of American lives."
Number 4: "More people were killed in World War II than any other war in history."
Number 2: "Millions died in German death camps."
Number 3: "An invasion of Japan would cost hundreds of thousands of American lives."
Number 4: "More people were killed in World War II than any other war in history."