What does the use of the term fault lines reveal about
 how the author views world wars?
 Read the excerpt from "A Quilt of a Country."
 Once these disparate parts were held together by a
 common enemy, by the fault lines of world wars and the
 electrified fence of communism. With the end of the
 cold war there was the creeping concern that without a
 focus for hatred and distrust, a sense of national
 identity would evaporate, that the left side of the
 hyphen-African-American, Mexican-American, Irish-
 American-would overwhelm the right.
 She believes that world wars are necessary.
 She believes that world wars divide Americans.
 She believes that world wars are a small concern.
 She believes that world wars are harmful to people.