Read the excerpt. What is the connotative meaning of fault lines in this excerpt.
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 over whelm the right
O something powerful and threatening
O something familiar and interesting
O something harmless and pleasant
O something amusing and impressive
