1938: German dictator Adolf Hitler begins his expansion throughout Europe with his occupation of Austria. In November, 191 synagogues are set on fire, 7,500 Jewish businesses are looted, and thirty thousand Jews are rounded up and sent to concentration camps. Eventually, over 6 million Jews will be killed before World War II and Germany's domination of Europe are brought to an end.

Today: With attacks on the World Trade Center Towers in New York and on the Pentagon in Washington, D.C., and with increasing fears about conventional, biological, and nuclear terrorism, the United States may be poised on the brink of yet another war.

1938: Advertisers begin to tap the vast power of radio. More than one-third of the billings at top advertising agencies are for radio ads; other ads are posted in newspapers, magazines, and billboards. Advertisers are beginning to realize that understanding the psychology of consumers...